Unit D: Mechanical Systems
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
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|
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