Point 44 of 45 — Lesson 1: Speed, Uniform Acceleration and Laws of MotionQuestion bank: 0 questions (0 with pictures)
45 Short answers to typical discussion questions
A train suddenly moves forward; where does a small bag under a seat go? Relative to the train it moves backward, because of its inertia (it tends to stay at rest).
Why is the first law a special case of the second?When ΣF = 0, ma = 0 so a = 0 — constant velocity.
What happens when an astronaut throws an object? He moves in the opposite direction (third law); a spacecraft can change direction by expelling gas.
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