Objects do not all bounce like rubber balls due to inelastic deformation.
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Reference literature confirms that objects fail to bounce like rubber balls when collisions are inelastic and energy is dissipated through deformation rather than being fully recovered.
Elastic collision
An elastic collision is when two objects collide and bounce back with little or no deformation. For example, two rubber balls bouncing together would be elastic. Two cars hitting each other would be inelastic, as the cars crumple, and do not bounce back. In a perfectly elastic collision (the simplest case), no kinetic energy is lost, and so the kinetic energy of the two objects after the collision is equal to their total kinetic energy before the collision. Elastic collisions occur only if there is no net conversion of kinetic energy into other forms (heat, sound). The other rule to remember when working with elastic collisions is that momentum is conserved. One-dimensional Newtonian
Consider two particles, indicated by subscripts 1 and 2. Let m1 and m2 be the masses, u1 and u2 be the velocities before the collision and v1 and v2 be the velocities after collision. Using Conservation of Momentum to write one formula
Since it is an elastic collision, the total momentum before the collision is the same as the total momentum after the collision.
Collision
A collision occurs when two objects come in contact with each other. All collisions have the same momentum before and after a collision. of collisions include car crashes, bouncing a ball, and playing pool. Collisions are made from two smaller sections called elastic and inelastic collisions. Elastic Collisions
In the case of playing pool or bouncing a ball, an elastic collision occurs. An elastic collision generally occurs when an elastic or hard object experiences a collision that bounces off another elastic or hard object, where the kinetic energy and momentum are the same before and after the collision. In an experiment, a small amount of energy will still be lost because of the friction between the surface and the objects. Inelastic Collisions
In the case of a car crash, an inelastic collision occurs. An inelastic collision generally occurs when a soft object experiences a collision that does not result in a bounce. Kinetic energy is lost during this type of collision because the energy is transformed into other forces. The momentum is the same before and after the collision.
# Why don't all objects bounce like rubber balls?
Tags: newtonian-mechanics, collision
- Score: 50
- Views: 21087
- Answers: 6
- Answered: yes
- Asked by: user24225 (617 rep)
- Asked: 2018-04-08
- Edited: 2018-04-08
- Site: physics
## Question
Some things don't bounce like rubber balls do. For example, books don't bounce much when dropped.
Why is it that some things bounce while others don't?
## Answers
### Answer by nicael (score: 91)
Because bouncing requires the object to be elastic - shortly after it deforms, its shape should return to the one it had before deforming.
In order for an object to bounce1, the sequence of events would be following:
object is going to touch the surface, having a kinetic energy $E$
the object deforms (doesn't shatter, break, explode, catch fire, etc) and its kinetic energy transforms into the internal energy.
there's no (or insignificant) loss in newly gained internal energy, i.e. no (or little) part of it is dissipated as heat, vibration, etc (guess there could be another form of dissipation...)
If all the above steps are passed, the object has to "un-deform" - internal energy gained because of deforming and not lost in the step 3 is turn
Everything we examined (3) — 2 independent sources
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