Momentum Conservation: Ball & Wall Impact

AI Thread Summary
The momentum of a ball at the exact moment it contacts a wall is zero, as all particles of the ball reach a state of zero velocity when fully compressed. This scenario assumes a perfectly uniform ball, where the instant of contact allows for no movement before rebound. While there may be a minuscule momentum imparted to the wall, it is negligible at the point of full compression. The discussion emphasizes the importance of this instant in understanding momentum conservation during impacts. Ultimately, the ball's momentum is zero at the moment of maximum compression.
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What is the momentum of a ball at the exact point where it comes into contact with a wall?
 
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Assume that the ball is so uniform that there is an instant of time when all particles of the ball have come to a zero velocity, fully compressed, and about to rebound. At that instant the momentum is 0. (I am ignoring the velocity that the ball imparts to the wall. Otherwise, there is some tiny momentum at the time of full compression and particles of the ball will not have 0 velocity till a small amount of rebound has begun.)
 
FactChecker said:
Assume that the ball is so uniform that there is an instant of time when all particles of the ball have come to a zero velocity, fully compressed, and about to rebound. At that instant the momentum is 0.

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