1. In uniform circular motion we have an acceleration and the speed doesn't change. But in projectile motion the speed does change under constant acceleration, why are they both classified as uniform acceleration phenomena? 2. Explain, in terms of Newton's Laws, why a quick jerk on a string may cause it to break, while the same change in momentum performed over a longer time will not. 3. Explain, from a force standpoint, why you need to reduce your normal driving speed around curves when it rains.
Answer the following concisely, in no more than three sentences.
1. In uniform circular motion we have an acceleration and the speed doesn't change. But in projectile motion the speed does change under constant acceleration, why are they both classified as uniform acceleration phenomena?
2. Explain, in terms of Newton's Laws, why a quick jerk on a string may cause it to break, while
the same change in momentum performed over a longer time will not.
3. Explain, from a force standpoint, why you need to reduce your normal driving speed around
curves when it rains.
4. If an object is in equilibrium (no net forces acting on it) it has a constant velocity. Is more
work required to keep it in motion?
5. Suppose you have a coin that is flat on one side, and the mass of the design on the other side
is fifty-five percent of the total mass. Is it possible to stand the coin on end?
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