1. Simple Machines

2. Common Simple Machines…

3. A machine is a device that makes work easier by changing the size or direction of a force. Examples: wheelchair, scissors, chopsticks

4. Work is the transfer of energy to an object by using a force that causes the object to move in the direction of the force. Work is done on an object if two things happen: 1) the object moves as a force is applied, 2) the direction of the object’s motion is the same as the direction of the force. Examples: pushing a ball up a hill

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6. A push or a pull exerted on an object in order to change the motion of the object; force has size and direction. Examples: people, bulldozer, static electricity

7. Work input is the work done on the machine. Work out put is the work done by the machine. Examples: opening a paint can

8. A machine or simple device without moving parts. Examples: lever, pulley, wheel & axle, inclined plane, wedge, screw

9. A machine made up of more than one simple machine. Examples: manual can opener

10. The Six Simple Machines LeverPulleyWheel & Axle Inclined PlaneWedgeScrew

11. A lever is a simple machine that has a bar that pivots at a fixed point, called a fulcrum. Examples: first-class lever (see saw), second-class lever (wheelbarrow or soda bottle opener), third-class lever (lifting weights or hammering a nail)

12. First-Class LeverSecond-Class LeverThird-Class Lever Elementary SchoolMiddle SchoolHigh School

13. A simple machine that has a grooved wheel that holds a rope or a cable. Examples: fixed, moveable, block and tackle

14. Types of Pulleys:

15. A simple machine consisting of two circular objects of different sizes. Examples: car’s wheel & axle, faucet

16. A simple machine that consists of a slanted surface along which objects are easier to push upward than to lift straight up. Examples: ramp, slide, stairs

17. A simple machine that is made up of two inclined planes that move; often used for cutting. Examples: knife, axe, door stop

18. A simple machine that consists of an inclined plane wrapped around a cylinder. Examples: screw, light bulb

19. The Six Simple Machines