The Wikipedia entry for "Elastic collision"
https://en.wikipedia.org/wiki/Elastic_collision
contains the following animation
https://youtu.be/wl0c6NMysY4
where the two bodies collide at point x and instantly reverse direction.
Does this seem correct?
Can the 2m mass body be stopped at point X of the collision and pushed
back by the smaller body?
Luigi Fortunati
[[Mod. note --
The Wikipedia animations assume (1) Newtonian mechanics, (2) 1-D motion
with no other forces acting, and (3) the elastic collisions occur very
quickly (i.e., each body's acceleration is nonzero for only a short time).
And saying that the collisions are *elastic* implies that there's no
permanent deformation of either body after the collision.
Within these assumptions, yes, the Wikipedia animations look correct.
The answer to your question "Can the 2m mass body be stopped at point X
of the collision and pushed back by the smaller body?" is yes, that's how
Newtonian mechanics works.
The Wikipedia article includes a section "Derivation of solution" which
nicely explains how to derive the solution from conservation of momentum
(which always holds) and conservation of energy (which holds in an elastic
collision).
-- jt]]
I dispute what the moderator wrote.
A body of mass 2m cannot bounce back (in place!) when it collides with a
body of mass m, otherwise a body of mass 3m, 10m, or 100m would also
bounce back.
It's obvious that a body of mass 100m, colliding with a body of mass m,
can only slow down but not stop in place and bounce back!
So, there should be a mass limit within which a larger body bounces off
a smaller body and beyond which it slows down but does not stop and does
not come back.
Does this limit exist? I don't think so.
Luigi Fortunati
| Date | Sujet | # | Auteur | |
| 11 Feb 26 |  Elastic Collision | 15 | Luigi Fortunati | |
| 13 Feb 26 |  Re: Elastic Collision | 5 | Luigi Fortunati | |
| 13 Feb 26 |   Re: Elastic Collision | 1 | Mikko | |
| 13 Feb 26 | Re: Elastic Collision | 1 | Petri Kaukasoina | |
| 13 Feb 26 | Re: Elastic Collision | 1 | Pierre Asselin | |
| 15 Feb 26 |  Re: Elastic Collision | 1 | Luigi Fortunati | |
| 15 Feb 26 | Re: Elastic Collision | 1 | Jonathan Thornburg [remove -color to reply] | |
| 15 Feb 26 | Re: Elastic Collision | 1 | Jonathan Thornburg [remove -color to reply] | |
| 16 Feb 26 | Re: Elastic Collision | 7 | Luigi Fortunati | |
| 28 Feb 26 |  Re: Elastic Collision | 1 | Luigi Fortunati | |
| 28 Feb 26 | Re: Elastic Collision | 1 | Mikko | |
| 5 Mar 26 | Re: Elastic Collision | 1 | Luigi Fortunati | |
| 8 Mar 26 | Re: Elastic Collision | 1 | Mikko | |
| 12 Mar 26 | Re: Elastic Collision | 1 | Luigi Fortunati | |
| 16 Mar 26 | Re: Elastic Collision | 1 | Mikko |
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