alleryStart learning →A hinged stick is struck at various points along its length. At which point is no force delivered to the hinge?
AAt the end farthest from the hinge point
BAt the percussion point between the ends
CAt the end closest to the hinge point
DAt any point, since the hinge is rigid
Answer & Solution
Correct answer: B. At the percussion point between the ends
1. Struck at the far end, the stick pushes backward on the nail.
2. Struck close to the nail, the stick pushes forward on the nail.
3. Because the force reverses between these two cases, there is an intermediate point where it vanishes.
4. That point is called the percussion point.
5. In tennis it is the sweet spot, where a hit sends little force or vibration into the hand.
_Source: OpenStax College Physics (CC BY 4.0), Ch 10 "Rotational Motion and Angular Momentum", section 10.6 Collisions of Extended Bodies in Two Dimensions_
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