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. • 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. 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. Levers – move from a fixed point

5. Pulleys – grooved wheel that holds
rope or cable

6. Wheel and axle – 2 circular objects
of different sizes (wheel is larger)

7. Inclined plane – straight slanted
surface

8. Wedge – two inclined planes that
move

9. Screw – inclined plane wrapped
around a cylinder

10. Compound machine – made of
more than one simple machine