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# Work and machines

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### Work and machines

1. 1. Work• Work is energy transferred that causes the object to move in the direction of the force — no movement, no work.• Formula for work: W = F x d• Units: – Work – joule (J) – Force – newton (N) – Distance – meter (m) or depends on problem
2. 2. • Power is the rate at which work is done• Formula: P = W/t• Units: – Power – watt (W) – Work – joule (J) – Time – seconds (depends on problem)
3. 3. Machines• Machine – device that makes work easier by changing the size or direction of the force• Machines let you swap force for distance or distance for force….you still do the same amount of work
4. 4. Levers – move from a fixed point
5. 5. Pulleys – grooved wheel that holds rope or cable
6. 6. Wheel and axle – 2 circular objectsof different sizes (wheel is larger)
7. 7. Inclined plane – straight slanted surface
8. 8. Wedge – two inclined planes that move
9. 9. Screw – inclined plane wrapped around a cylinder
10. 10. Compound machine – made ofmore than one simple machine