# Simple machines

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### Simple machines

1. 1. Simple Machines SOL 3.2
2. 2. Machine – a tool that helps us do work Machines help us by: 1. Changing the amount of force on an object. 2. Changing the direction of the force.
3. 3. Force is a push or pull that changes the motion or shape of an object. Example: I push a bookshelf to move it.
4. 4. Energy is the ability to do work. Example: I must have energy to run the mile.
5. 5. Work is the result of force moving an object. Example – Picking up something heavy is hard work!
6. 6. Gravity Gravity is the force that constantly pulls objects toward Earth.
7. 7. Simple machines – have few or no moving parts • Lever • Inclined Plane • Wedge • Screw • Wheel and Axel • Pulley
8. 8. Lever –made of a board or bar set on top of a fulcrum. It is used to lift weight Example: seesaw, crowbar, baseball bat, rake
9. 9. Inclined Plan – a slanted surface to make lifting easier Example: ramp, stairs
10. 10. Wedge – two inclined planes together used to raise an object or split an object. Example: knife, door wedge, ax
11. 11. Screw – an inclined plane wrapped around a pole or shaft that is used to hold materials together or drill holes. Example: drill bit, screws
12. 12. Wheel and Axel – a wheel that turns on a post to help move things quickly and easily Example: steering wheel, doorknob, screwdriver
13. 13. Pulley – made of rope and string wound around a reel to change the direction of a force. Example : flagpole, clothesline, cranes, fishing reel
14. 14. Compound Machine – two or more simple machines working together. Examples: Bike Car
15. 15. How Work is Done Energy Force Function Work is done!