Inertia Review
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Many automobile passengers have suffered neck injuries when struck by cars from behind.  How does Newton's law of inertia apply here?  How do headrests help to guard against this type of injury? *
2 points
Suppose you place a ball in the middle of a wagon, and then accelerate the wagon forward.  Describe the motion of the ball relative to (a) the ground and (b) the wagon. *
2 points
If an elephant were chasing you, its enormous mass would be most threatening.  But if you zigzagged, its mass would be to your advantage.  Why? *
1 point
When you compress a sponge, which quantity changes: mass, inertia, volume, or weight? *
1 point
Two closed containers look the same, but one is packed with lead and the other with a few feathers.  How could you determine which had more mass if you and the containers were orbiting in a weightless condition in outer space.   *
2 points
If you are sitting in a bus that is traveling along a straight, level road at 100 mph, you are traveling at 100 mph too.  If you hold an apple over your head, how fast is it moving relative to the road? How about relative to you?  If you drop the apple, does it still have the same horizontal motion? *
3 points
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