Unit D: Mechanical Systems
Class Notes
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Assigned Practice:
Topic 1 - Page 284 #'s 1-6
Topic 2 - Page 295 #'s 1-3 Topic 3 - Page 302 #'s 1-3 Topics 1-3 Review - Page 303 #'s 1-20 | ||||||
Topics 1-3 Review - ANSWER KEY
1. joule
2. sprocket
3. lever
4. fulcrum
5. winch
6. driver
7. kinetic
8. work
9. pulley
10. gear
11. efficiency
12. arm
13. Class 3
14. A Class 3 lever has a mechanical advantage that is less than 1. An example of a Class 3 lever is a hockey stick.
15. It is more practical to use a wheel and axle rather than a lever to steer a car, control the volume on a radio, or open a door (using a doorknob).
16. The handle is the effort arm, and the axle the handle turns is the load arm. A winch is like using a Class 1 lever over and over again.
17. See picture below.
18. All of the responses describe something that machines do.
19. A simple machine can make work easier by reducing the amount of effort force required to life a load, by changing the direction of the effort force, or by reducing the distance over which the effort force must act.
20. In order to gain a mechanical advantage, the effort force must act over a larger distance for a longer period of time.
| Topic 7 - Machines Throughout History - Page 341 #'s 1-5 |
| Topic 8 - People and Machines - Page 350 #'s 1-5 |
| Topics 7/8 Review - Page 351 #'s 1-11, 13, 15, 16 |
