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# Simple machines

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### Simple machines

1. 1. Simple Machines SOL 3.2
2. 2. Machine – a tool that helps us do workMachines help us by:3. Changing the amount of force on an object.5. Changing the direction of the force.
3. 3. Force is a push or pull thatchanges 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. GravityGravity 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 barset on top of a fulcrum. It is used to lift weight Example: seesaw, crowbar, baseball bat, rake
9. 9. Inclined Plan – a slantedsurface to make lifting easier Example: ramp, stairs
10. 10. Wedge – two inclined planestogether used to raise an object or split an object. Example: knife, door wedge, ax
11. 11. Screw – an inclined planewrapped 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 thatturns on a post to help move things quickly and easily Example: steering wheel, doorknob, screwdriver
13. 13. Pulley – made of rope and stringwound around a reel to change the direction of a force. Example : flagpole, clothesline, cranes, fishing reel
14. 14. Compound Machine – two or moresimple machines working together.Examples:BikeCar
15. 15. How Work is DoneEnergy Force Function Work is done!