From Newsgroup: sci.physics.research

The collision in the animation
https://www.geogebra.org/classic/sfzdbre4
is composed of two phases.

The first is when body B decreases its velocity to the left from -1 m/s
to zero.

The second is when body B changes direction and accelerates from zero to
+1/3 m/s.

In the fleeting moment of the first phase, the two bodies move in
opposite directions, both slowed by the two opposing forces F1 and F2,
until body B stops before changing direction.

But when body B stops, 2-kg body A (which does not stop) continues to
push it to the right, accelerating it from zero to +1/3 m/s.

In this second phase, during which body B accelerates, what does body A do?

Does it also accelerate along with body B (to which it is attached), or
does it not accelerate?

Luigi Fortunati

[[Mod. note -- As I've written before in this newsgroup, it's not that
simple.

Your animation is labelled "Inelastic Collision". In an inelastic collision the bodies *deform* (crush) and that does internal work (dissipated as heat).

As soon as the bodies collide and start to deform (crush), different parts
of each body have different velocities and accelerations, so we can't meaningfully refer to "the velocity" or "the acceleration" of either body
-- we have to be more specific and say which part of the body we're referring to.

If we do this, and refine Luigi's questions to make them precise enough to
have a well-defined answer, then we'll need to expliticly model the internal dynamics of how the bodies deform (crush) to answer those questions.
-- jt]]
--- Synchronet 3.21a-Linux NewsLink 1.2