Dynamics quizzes
How forces, rotation and energy explain motion, from falling stones to a yo-yo unwinding.
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From Dynamics: Why a Yo-Yo Falls Slower Than a Stone
A car drives around a curve at a perfectly constant speed. Is it accelerating?
- No, because its speed is constant
- Yes, toward the center of the curve
- Yes, but only along its direction of travel
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Answer: Yes, toward the center of the curve
Acceleration is any change in velocity, including direction; turning requires an acceleration of v²/r toward the center.
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