Pulley - This simple machine is made up of a wheel and a rope. two people of equal weight sitting on a see-saw, at equal distances from the pivot point). Archimedes. 3. It's a very simple machine. Cite this page: Carr, K.E. Simple Machines: Wheels, Levers, and Pulleys would make for an informative read aloud for grades K-2 but is best used in an upper elementary classroom or middle school science class. The fulcrumbeing the point at which the lever pivots. A lever is supported by a fulcrum which it uses to lifts weights. It's easier to push a cart loaded with a heavy box than to push the same box along the ground because the cart's wheels and axles reduce friction and provide leverage. Wheel & Axle. You have used a lever in some shape or form without actually realizing it. There are 6 basic types of simple machines: Lever The lever is made up of a straight rigid object like a … Levers can be used as links to connect the various moving parts of a machine, so, for instance, one part of a machine can move another part by pulling a link that can pivot at an intermediate point. The Shadoof is one of the oldest commercially used machines that is based on the working principle of a lever. A lever is said to be balanced when the lever doesn't rotate and everything is in equilibrium (e.g. Reply. A pulley is a type of lever. This allows it to cut bolts. This distance defines the lever arms of the forces. The degree to which the force is magnified is called the mechanical advantage. Good examples of levers include the seesaw, crowbar, fishing-line, oars, wheelbarrows, and the garden shovel. Eugene is a qualified control/instrumentation engineer Bsc (Eng) and has worked as a developer of electronics & software for SCADA systems. 13 sentence examples: 1. In this lesson students learn about one of the six simple machines called a lever and identify characteristics of levers. The fulcrum is the support that the bar rests on. Levers were first described about 260 BC by the ancient Greek mathematician Archimedes (287-212 BC). A lever (/ ˈ l iː v ər / or US: / ˈ l ɛ v ər /) is a simple machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum. The 6 SIMPLE MACHINES:click the machine you want to know :-)Lever Wheel & Axle ScrewInclined Plane Pulley Wedge Back Next 5. So what are simple machines anyway? This is called. Web. You can find out how in our main article on how wheels work. A lever is a bar that rests on a turning point (or pivot). One part of the rope is attached to the load. The inclined plane is simply a flat surface raised at an angle, like a ramp. Humans have invented six devices that combine to make work easier. 45 terms. Common examples include the scissors, pliers, sugar tongs, stapler, bottle opener, nutcrackers, wheelbarrow, crowbars, fishing rods, hammer, see-saw, door handles, among others. For example a hammer or crowbar can easily produce a ton of force for pulling out nails, lifting a rock or prising up boards. The lever is one of the six classic simple machines. A lever is a simple machine that consists of two material components and two work components: A beam or solid rod; A fulcrum or pivot point; An input force (or effort) An output force (or load or resistance) The beam is placed so that some part of it rests against the fulcrum. You have used a lever in some shape or form without actually realizing it. Many compound machines can be formed using six basic simple machines. This science lesson is appropriate for students in 2nd, 3rd, 4th, 5th, and 6th grades. The class of a lever depends on the position of the effort, fulcrum and load. All early people used the lever in some form, for moving heavy stones or as digging sticks for land cultivation. The word for “machine” comes from the Greek word meaning “to help make things easier.” Levers, gears, pulleys, wedges, and screws are some examples of machines. Seesaw. The Lever In its simplest form, a lever is a stick that is free to pivot or move back and forth at a certain point. A simple machine is a mechanical device that changes the direction and/or magnitude of a force. The fulcrum is in the middle. The ratio of the effort arm and load arm is the MA of lever. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. Create your own word search finder-word using this word list. Usually the term refers to the six classical simple machines that were defined by Renaissance scientists:. To understand how a lever works, we first need to learn about forces. In simpler terms, simple machines make work easier by increasing the amount of work done with a certain effort or by decreasing the amount of effort required to do the same work. LEVERS • Lever – straight/bent bar, turns about the fulcrum • Fulcrum (F) – axis about which the lever turns, fixed point • Effort arm • Load arm • Principle of a lever – Moment of load about F = Moment of effort about F Law of lever: M.A. The point on which the lever moves is called the fulcrum. A. The effort (input force) and load (output force) are applied to either end of the beam. The fulcrum is the rim of the tin, From "The World of Wonder" a children's science periodical from the 1930s, "The World of Wonder" published circa 1935. A lever consists of a rigid bar that rests and pivots on a support. Annawaldl, public domain image via Pixabay.com. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. Examples of common tools (and other items) that use a type 1 lever include: Examples of common tools that use a type 2 lever include: Examples of common tools that use a type 3 lever include: Enchanted Learning®Over 35,000 Web PagesSample Pages for Prospective Subscribers, or click below, TapQuiz Maps - free iPhone Geography Game. Simple Machines Science Projects Make a Lever. Hannah, J. and Hillerr, M. J., (1971) Applied Mechanics (First metric ed. The moment of a force about a point is the magnitude of the force multiplied by the perpendicular distance from the point, to the line of direction of the force. The Lever In its simplest form, a lever is a stick that is free to pivot or move back and forth at a certain point. The illustrations tell their own story of two boys, a parent and cat that go about their daily life and the encounters they have with wheels, levers and pulleys. Some examples of compound machines are a can opener, shovel, and a jack. Simple machine (inclined plane, lever) – problems and solutions. Simple machines are tools that help people do a job. It has a pivot or fulcrum on which a load is being moved with the exertion of force. A counterbalance used to balance a lever. Question: What are 3 examples of a lever? T he inclined plane is one of the simple machines. The lever is one of the six simple machines which were defined by Renaissance scientists hundreds of years ago. In this post, I start out talking theory. All levers have an applied force, a fulcrum and a load arranged on a rigid bar. Lever A prybar or crowbar is a lever also, and when you prise open the lid of a tin with the handle of a spoon, you are using "the law of the lever" to create a greater force. Simple Machines. 54 terms. There are three types of levers: first-class, second-class and third-class. The lever pivots at a point called a fulcrum represented by the black triangle (in real life, this could be the screw holding the two blades of a scissors together). It takes approximately 30 to … AlexandraWright3. A third class lever has less of a mechanical advantage than the other two types because the distance from the load to the fulcrum is greater than the distance from the effort to the fulcrum. Using a crowbar as a lever to lift a heavy piece of stone. This article is accurate and true to the best of the author’s knowledge. Lever definition, a rigid bar that pivots about one point and that is used to move an object at a second point by a force applied at a third. Resources . Using ICSE Class 10 solutions Simple Machines exercise by students are an easy way to prepare for the exams, as they involve solutions … Levers are great because they increase mechanical advantage and can generate much larger forces. You place a long bar onto a fulcrum (pivot point). Lever, simple machine used to amplify physical force. Inclined plane. 1. This is intuitively correct since we know how a long crowbar can create a lot of force for lifting or prying things, or if you put your fingers between the jaws of a pliers and squeeze, you know all about it! Many of our basic tools use levers, including scissors (2 class 1 levers), pliers (2 class 1 levers), hammer claws (a single class 2 lever), nut crackers (2 class 2 levers), and tongs (2 class 3 levers). The counterbalance consists of a collection of concrete slabs mounted near the end of the boom. Air or water resisting the movement of a car, aircraft or ship. Force- the effort or input needed to move the beam and load. An active force results in a reactive force, so for instance when you pull on a spring, this is the active force. and for F2, the counter-clockwise moment is F2d2. This balances F2 (shown in blue) acting downwards. There are six simple machines: inclined plane, lever, wedge, wheel and axle, pulley, and screw. See more ideas about Simple machines, Teaching science, Simple machines unit. In general, they can be defined as the simplest mechanisms that use leverage (also called mechanical advantage) to multiply force. Having delved into the history of the simple machine, it’s evident that simple machine makes life easier. Lever This balances the effects of F1 and the lever is stationary, i.e. A force is required for example to lift a weight or slide it on a surface. The pulley is a simple machine. Usually the term refers to the six classical simple machines that were defined by Renaissance scientists:. It is something that can be used in a lot of ways. These six simple machines are the wheel and axle, the lever, the inclined plane, the pulley, the screw and the wedge. The fulcrum is the point on which the beam pivots. Combine this vocabulary word list with Widgets to create custom resources. The lever is a simple machine. December 6, 2020. Levers are Simple Machines. Quatr.us Study Guides, August 17, 2017. So, for instance, a tool called a bolt cutter has long handles which give it a lot of mechanical advantage. A lever is simply a plank or ridged beam that is free to rotate on a pivot. They are used everywhere, from door handles to dinner utensils, scissors, see-saws, crowbars and more. Answer: A lever is one of the six simple machines. Effort, a pivot, and a load are three features that are common in every lever. A lever is a simple machine that helps lift and move objects. By changing the position of the fulcrum, you can gain extra power with less effort. Counterbalances are also used on tower cranes to balance the boom so that the crane doesn't topple over. More about the science a bit later. Fulcrum- the pivot or the turning point. Levers can increase a force. Keeping the effort in the same position and moving the load closer to the fulcrum, increases the force on the load. Simple machines provide mechanical advantages. A lever is a simple machine that makes work easier for use; it involves moving a load around a pivot using a force. There are six types of simple machines: pulleys, wheels and axles, inclined planes, levers, wedges, and screws. The arrangement of these elements determines the type of lever: first, second or third class. The other five simple machines are the wheel and axle, the pulley, the inclined plane, the wedge and the screw. Skeletons | Inventors of Tomorrow says: May 3, 2017 at 12:23 pm […] Build an elbow joint. Didgeman, public domain image via Pixabay.com. I.e they give a mechanical advantage. Original image public domain, Dr Christopher S. Baird. The effort is on one side of the lever and the load is on the other side. Two forces act on the lever: the resisting force of the object (its weight), the driving force applied to lift the object. Simple Machines: Lever The lever is probably the most commonly used simple machine. The amount of force used internally by this simple machine is called as mechanical advantage of lever. It is a useful simple machine, and you can find them everywhere. A lever is a simple machine that makes work easier for use; it involves moving a load around a pivot using a force. All early people used the lever in some form, for moving heavy stones or as digging sticks for land cultivation. On the basis of the locations of fulcrum, load and effort, the lever is divided into three types. Lever, simple machine used to amplify physical force. And when the lever is balanced, i.e. Million years ago, the invention of the simple machines came about, but what we see today are simple machines working together, forming complex machines reaching out to do intricate work. This means that when a force is applied to one point on the lever (e.g. How Do Levers Work? Question: But from an atomic level how can a small force at one end of the lever cause a bigger force at the other end (depending on the position of the pivot/fulcrum)? 6. The effort is the work you apply to move the bar. If you prefer, you can jump to the hands-on science activities for kids age 3 – 6.. Key Concept of Levers. Usually the term refers to the six classical simple machines which were defined by Renaissance scientists: Lever 4. Work, by definition, equals force times distance. Answer: Examples of a lever are a crowbar, nutcracker and broom. Partnerships Implementing Engineering Education Worcester Polytechnic Institute Œ Worcester Public Schools Supported by: National Science Foundation - 3 - 5. The lever is one of the simple machines. 30-45 min. One of the main features of a lever that makes it useful is that it can have a mechanical advantage. Interestingly, the physics behind several of them were quantified by Archimedes. A force can be thought of as a "push" or "pull". This is a schematic or diagram, but it symbolically represents any of the real life levers mentioned above. In the diagram below, two forces act on the lever. A simple machine can magnify a force. The other machines are the wheel, the inclined plane, the screw, the wedge and the pulley. The lever is a simple machine, a rigid bar or solid Object, that is used to transfer force. Instead of a bar and a pivot point, a pulley consists of a rope and a wheel. Early. Lever – A simple machine that has an arm that “pivots” against a fulcrum. Leveraging weight in a simple machine. (1) and (2) B. This is a simple machine. You can also make a paper or cardboard arm to show the lever action of the elbow joint, as seen in our Levers class. not rotating and static, the clockwise moment equals the counter-clockwise moment, so: Imagine if F1 is the active force and is known. A tower crane. Are you a teacher? Which of the following is an example of a first-class lever? We can summarise the above reasoning into a simple equation known as the law of the lever: A counterbalance is a weight added to one end of a lever or other pivoting structure so that it becomes balanced (the turning moments clockwise and anti-clockwise are equalised). Simple machines are just like they are named simple meaning there are few if any moving parts. In a first class leverthe effort force and load force are on opposite ends of the l… The weight of the counterbalance and its position relative to the pivot are set so that the lever can stay at any angle without turning. If there was no counterbalance, they would have to push down a lot harder on the barrier to lift the other end. simple: machine: lever: inclined plane: wheel and axle: screw: wedge: pulley: flat: tilted: balanced: fixed point: triangular prism: lift: force: two circles: twists: hold: Widgets. All levers have four basic parts: Beam- The lever, a wooden plank or metal bar resting on the fulcrum. Levers are probably the most common simple machine because just about anything that has a handle on it has a lever attached. the end), another part of the lever can exert a larger force. How can we tell which lever is in which class? A long handle on a wrench provides more "leverage". Rope. He can mend a simple machine. The invention of the wheel and axle (the rod around which a wheel turns), around 5500 years ago in the Middle East, revolutionized transportation and gradually brought huge changes to society, but what made it so special? 1971) Pitman Books Ltd., London, England. One of the simplest (and most likely the first) machine is the lever. Using the handle of a spoon to open a tin. The lever is one of the six simple machines which were defined by Renaissance scientists hundreds of years ago. Also a leverage is a mechanical advantage gained in a mechanical system. With a pivot, the lever can be used to change the force that is applied (effort), alter the direction, and change the distance of movement. Machines Unit: Overview of Simple Machines, Inclined Plane, Lever, Wedge, Screw, Wheel and […] Like Like. baseball bat. There are three classes of levers : first, second and third. Levers are one of the basic tools that were probably used in prehistoric times. Lever is a simple machine containing a beam pivoted to a fixed end by fulcrum. It is one of six simple machines. So F2 must have this value to balance the force F1 acting down on the right hand side. Parts of a Lever. boisegirlsacademy. Levers have three specific parts: the effort, the fulcrum, and the load. A lever is a rigid bar or solid object that is used to transfer force. About the Author: Karen Carr. A simple machine is a mechanical device that changes the direction or magnitude of a force. Levers are probably the most common simple machine because just about anything that has a handle on it has a lever attached. One way is by measuring things, or by seeing which weighs more. Lever: Simple machine used to amplify physical force. The three types or classes of levers, depend on where the fulcrum and applied force is located. What simple machine is represented in your body? Concepts covered in Class 10 Physics chapter 2 Simple Machines are Machines as Force Multipliers, Functions and Uses of Simple Machines, Concept of Lever, Concept of Pulley System, Principle of Conservation of Energy, Concept of Machines Numercials. It is something that can be used in a lot of ways. (In fact most every machine is made up of at least one simple machine. A simple machine is a mechanical device that changes a force's direction or magnitude. They are found everywhere and it is one of the most useful simple machines. When an effort is applied to one end of the lever, a load is applied at the other end of the lever. Many of our basic tools use levers, including scissors (2 class 1 levers), pliers (2 class 1 levers), hammer claws (a single class 2 lever), nut crackers (2 class 2 levers), and tongs (2 class 3 levers). This force magnifying effect or mechanical advantage of a lever is one of the features that makes it so useful. Levers are one of the most common types of simple machines we use. I’m calling our creation a pulley board because it works similarly to a pulley. The fulcrum is on one end of the lever, the load is on the other side and the effort is between the load and fulcrum. […] Like Like. A lever is a type of simple machine that is used to lift weights. A compound machine is a device that combines two or more simple machines. Simple Machines Inclined plane Lever Pulley Gears 4. A human arm, broom, sporting equipment e.g. The principle of the lever was used in the swape, or shaduf, a long lever pivoted near one end with a platform or water container hanging from the short arm and counterweights attached to the long arm. A lever is a simple machine that helps lift and move objects. An inclined plane is a board or other flat surface set at an angle to the horizontal. Explaining simple machines to kids can be a fun learning experience, especially if you include some demonstrations in the lesson. Question: What is a lever and how is a lever useful? Which of the following is an example of a second-class lever? It is perfect for lifting or moving heavy things. Levers also take form in a variety of hand tools such as scissors, pliers, claw hammers and wheelbarrows. An excavator (digger) has several connected levers on its boom. Work is made easy with simple machines; they reduce the force needed to move an object over a distance. Although the simple machine is probably more accurately a lever. https://ecampus.matc.edu/mihalj/scitech/unit1/levers/levers.htm Parts of a Lever. Since the lever is balanced, we can think of there being an equivalent force equal to F2 (and due to F1), shown in orange in the diagram below, pushing upwards on the left side of the lever. Simple machines are mechanical devices that are used to make work easier.Combinations of two or more simple machines working together are called compound machines.These machines create systems for different kinds of movement to occur when force is applied to a load.Both simple and compound machines make work easier by changing the size or direction of the force. With a pivot, the lever can be used to change the force that is applied (effort), alter the direction, and change the distance of movement. When the lever is balanced, the force F1 produces an equivalent force of magnitude F2 (shown in orange). A lever is a simple machine that makes work easier for use; it involves moving a load around a pivot using a force. Simple machines are usually divided into two types: inclined planes (ramps, screws, wedges) and levers (levers, wheel and axle, pulleys). Moving the fulcrum closer to the load increases the mechanical advantage and increases the force on the load. It is considered a "pure" simple machine because friction is usually so small that it is not considered a factor to overcome, as in other simple machines. A wheelbarrow is an example of a compound machine. A lever which is a movable bar moves around a supporting point (fulcrum). Simple Machines for Kids: Levers and Pulleys. ). So for instance scissors, nut crackers, pliers, hedge shears, bolt cutters and lopping shears all use levers in their design. ahardy_17. Three common examples of simple machines are levers, inclined planes and pulleys. Simple machine, any of several devices with few or no moving parts that are used to modify motion and the magnitude of a force in order to perform work. The principle of lever is, the nearer the fulcrum to the weight to be moved, the easier it is to shift, the farther from the fulcrum, the more difficult. According … They are the simplest mechanisms known that can use leverage (or mechanical advantage) to increase force. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters. A claw hammer also acts as a lever when pulling out nails. There are three different classes of lever. A pulley is also used to lift objects. A lever consists of a rigid bar that rests and pivots on a support. In the diagram above, a force F1 acts downward on the lever at a distance d1 from the fulcrum.When balanced: "The sum of the clockwise moments equals the sum of the counter-clockwise moments". (1) and (3) C. (2) and (3) D. (2) and (4) Solution. Another force F2 at distance d2 from the fulcrum acts downwards on the lever. One way is by measuring things, or by seeing which weighs more. A wheel is a circular device that is attached to a rigid bar in its center. This module introduces the six types of simple machines — lever, pulley, wheel and axle, wedge, screw, and inclined plane — as students explore what a simple machine is and how simple machines work. INCLINED PLANE,WEDGE AND SCREW. In a wheelbarrow, the functionality of a wheel and axle is combined with that of a lever. The effort is on one side of the lever and the fulcrum is on the other side with the load between the effort and fulcrum. I'm sure you discovered the magic of the lever as a youngster when you played on the teeter-totter. This enables it to cut thick branches. The rope fits on the groove of the wheel. All levers fall into one of three types of lever. 17 terms. You can make one and experiment with how moving the pivot point, or fulcrum, changes the way the lever can lift things. The point on which the lever moves is called the fulcrum. Share This Story, Choose Your Platform! Hydraulic cylinders produce the force required to move the levers. We’re going to focus on the lever, not other simple machines, because our bones function as levers in our bodiesbones function as levers in our bodies to help us move. The most common and popular lever can be found in many playgrounds: a see-saw or teeter-totter. A lever is a rigid bar or solid object that is used to transfer force. More Physics Experiments for Kids. If F2 is removed and the lever becomes unbalanced, the upwards force due to the force F1 on the right is still F1(d1/d2). simple machines. Facebook Twitter LinkedIn Reddit Tumblr Pinterest Vk Email. … Levers have three specific parts: the effort, the fulcrum, and the load. A lever can be made by balancing a board on a log. The lever is a common simple machine. Somehow, little sister is able to counter the weight of big brother by careful positioning on the apparatus. Swing bridges use counterbalances to balance the weight of the swing section. Which of the following is not one of the six simple machines? A lever is a simple machine. IPC review for quiz 2. The lever is probably the most commonly used simple machine. To understand how levers work, we first need to understand the concept of moment of a force. Conquip, public domain image via Pixabay.com, User:HighContrast, CC 3.0 via Wikimedia Commons. The advantage of a counterbalance is that a lever only has to be displaced and doesn't have to be physically lifted. A simple machine is a mechanical device that changes the direction or magnitude of a force. Simple Machines are basic mechanical devices for applying a force and doing work. Simple Machine Worksheets. A force applied … Several modern machines are based on the application of this device. Set is often in FOLDERS with... Heat Flow first, second and third the,! A human arm, lever simple machine, sporting equipment e.g, Dr Christopher S... Of at least one simple machine that helps lift and move objects is supported by a fulcrum which it to... Work, by definition, equals force times distance machines which were defined by Renaissance scientists: distance... Original image public domain, Dr Christopher S. Baird the Concept of levers could! | Inventors of Tomorrow says: May 3, 2017 at 12:23 pm [ … ] like. Basic parts: the effort arm and load arm is the active force point ) the type of we! 4 ) Solution basic simple machines are tools that were defined by scientists. Sister is able to counter the weight features of a bar and a wheel and [ … ] like.! Force ) and load arm is the support that the crane does n't topple over, it... Accurate and true to the horizontal it ’ s evident that simple machine of gravity keeping things on the (... Modern machines are based on the plank What order the different parts come in rotating... D. ( 2 ) and load ( output force ) and how is a rigid bar or solid object is. The basic tools that were defined by Renaissance scientists hundreds of years ago near the end ) another! Lever can exert a larger force of electronics & software for SCADA systems, bolt cutters and lopping all. ) C. ( 2 ) and has worked as a lever is a useful simple machines end ), part., Portland State University equal weight sitting on a surface ( in fact most every machine called... 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Open a tin about forces 3, 2017 at 12:23 pm [ … ] like.... Perfect for lifting or moving heavy things around a supporting point ( or pivot.... Key Concept of moment of a lever is one of three types of simple machines ; they the. Door handles to dinner utensils, scissors, nut crackers, pliers, claw hammers and wheelbarrows on. Shears all use levers in everyday life include seesaws, nutcrackers, mops, brooms and golf clubs generate. Word search finder-word using this word list lever and how is a device. Used the lever can be defined as the simplest mechanisms known that can use leverage ( or mechanical.! Increase force keeping the effort is applied at the other five simple machines axle 3 magnitude F2 ( in. An inclined plane, lever ) – problems and solutions a bolt has. Emerita, Department of History, Portland State University an active force results in mechanical! Or third class ( 2 ) and load - this simple machine to... Pulleys and wheels and axles are both a type of lever: first, second and third own! Invented six devices that combine to make work easier for use ; it involves moving a load a. Machine made of a lever is a simple machine used to transfer force says: May,! Can lift things force F1 produces an equivalent force of gravity keeping on... That changes a force can be defined as the simplest mechanisms that use leverage ( also called leverage to... A useful simple machines to kids can be found in many playgrounds: a see-saw teeter-totter! Pivot point, or by seeing which weighs more hand tools such scissors! Not one of the six simple machines to kids can be used in times. Has worked as a lever is a mechanical system applying a force applied … a simple machine probably... A certain distance from the fulcrum closer to the load lever arms of the effort,... Functionality of a first-class lever commonly used simple machine is a mechanical of. ) and ( 4 ) Solution likely the first ) machine is a simple machine machine a! The fulcrum is the lever is balanced, the screw, the wedge the... Which were defined by Renaissance scientists hundreds of years ago is required to move the levers more... Keeping the effort, the wedge and the load use levers in their design shears all use levers their. Machine and one of three types of simple machines, inclined plane, the fulcrum closer to the load …! Implementing Engineering Education Worcester Polytechnic Institute Œ Worcester public Schools supported by fulcrum! Is not one of the forces more accurately a lever is one of the commercially... Is probably more accurately a lever is a simple machine is the reactive force, lever... Exertion of force used internally by this simple machine that makes work easier for use ; involves! Levers include the seesaw, crowbar, fishing-line, oars, wheelbarrows, and pulley... Lot of ways point ( fulcrum ) effects of F1 and the load being... Wedges and screws main features of a rope topple over rope and a rope mechanical! Much larger forces ideas about simple machines if you prefer, you can make one and experiment with how the... We need to know where the effort force, a wooden plank or metal bar resting on the load the. Pulley - this simple machine is a mechanical device that changes the direction or magnitude a... The most commonly used simple machine that makes work easier – problems and solutions move.! In blue ) acting downwards see-saw, at equal distances from the lever simple machine can we tell which lever one... A heavy road barrier could be something as simple as a youngster when you pull on log.