If I throw a ball at a wall does the ball stop (however briefly ) before changing direction to return to me?
If Yes, did the fly crashing into the front of the oncoming train stop the train as it reversed direction. Did the train stop ? if not how did the fly ?
Surely if the fly stops the train does. LOL
The answer is essentially the same in both cases.
You cannot, in this context, usefully talk about the velocities of the fly, the ball or the train, because on impact there is always deformation (look at a fly that has been squashed by a train!). Neither the fly nor the train are a single object; we should think instead about the velocities of their component particles.
Each particle of the ball or fly, on impact, eventually suffers an acceleration which reverses its motion. Particles of the train suffer an equal but opposite acceleration. When a particle of fly is actually in contact with a particle of train, the two have the same velocity - but for an infinitesimal time (1/infinity seconds, zero in round figures).
Other particles of fly collide with the one that had the first impact, and the shock wave (transient compression) propagated through the fly's body will be what causes them to reverse. The particles in each collision (a pair of particles moving in opposite directions) will momentarily share a velocity.
The resultant, of course, since the train has many more particles, is that the train continues and the fly reverses. Except for the elasticity which causes the ball to regain shape after being deformed, the same thing happens with a bouncing ball.
Jessica Mendoza Softball Training - CATCH: Flyball : Softball.com
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