1. Work and Machines Review

2. Unit used to measure work
Joules

3. The rate at which work is done
Power

4. Unit of power
Watt

5. Three ways a machine can make work easier
Increase the distance
Change the direction of the force
Multiply the force

6. Device that does work with only one movement and changes the size or direction of the force
Simple Machine

7. Two things that must happen for something to be considered work.
The object must move
The movement must be in the direction of the force.

8. What’s work?
A scientist delivers a speech to an audience of his peers.
A body builder lifts 350 pounds above his head.
A mother carries her baby from room to room.
A father pushes a baby in a carriage.
A woman carries a 20 kg grocery bag to her car?

9. What’s work?
A scientist delivers a speech to an audience of his peers. No
A body builder lifts 350 pounds above his head. Yes
A mother carries her baby from room to room. No
A father pushes a baby in a carriage. Yes
A woman carries a 20 km grocery bag to her car? No

10. Formulas

11. Work
Force x Distance

12. Power
Work
Time

13. Write the handy dandy formula rearranging circles for work and power.

14. Name the Machine

15. ramp
Inclined Plane

16. Bar that rotates around a fixed point
Lever

17. Inclined plane with one or two sloping sides
Wedge

18. A winding mountain road
Inclined Plane

19. Two or more simple machines working together
Compound Machine

20. Knife
Wedge

21. Leaf rake
Lever

22. Mechanical Advantage

23. The amount by which a machine multiplies the input force
Mechanical Advantage

24. What would be the mechanical advantage of the following?

25. What would be the mechanical advantage of the following?

26. What would be the mechanical advantage of the following?
How much
would
the weight
feel like
it weighed?

27. Which would have the most MA and Why?1 3 2

28. If used as a lever, which would have the most MA and why?