Can you give me a case where coefficient of restitution is greater than one?

Question

In 1-D collisions can coefficient of restitution be greater than one?If so,state an example.

Answer 1

Well I can't but I know of some folks working on "perpetual motion" machines that say they can :>)



I'm afraid in our "real world" even a coefficient of restitution = 1 is not possible.

Answer 2

Coefficients of resolution describe how "elastic" the collision is.



A perfectly elastic collision has a CoR of 1.

An inelastic collision has a CoR somewhere between 0 and 1.



If CoR is greater than 1, that would somehow imply that the objects ended up with more kinetic energy than they had before the collision. Usually a collision converts kinetic energy in the system into other forms, lowering the collision's CoR.



Perhaps in a collision where the collision itself converts stored potential energy into kinetic energy, a CoR greater than 1 is possible. Can you think of any examples like that?

Answer 3

As Will pointed out COR>1 would imply that added kinetic energy to the system .Which i would say is practically impossible and unrealistic but theoretically possible ..... for example throwing Two landmines towards each other which explode on collision and separate at a speed greater than the speed of approach .......



Well can you think of negative COR and how can it be conceived

???

Answer 4

Watch the original 1961 release of Disney's "The Absent-Minded Professor" which introduces a substance called "flubber".



As my college roomate Eric explained, it has a COR > 1.



Cheers!