Elastic and Inelastic Collisions An elastic collision is one in which the total kinetic energy of the colliding objects is conserved, meaning it remains...
An elastic collision is one in which the total kinetic energy of the colliding objects is conserved, meaning it remains the same before and after the collision. This means that the total mass of the objects is preserved, and their velocities after the collision are the same as their velocities before the collision.
Examples:
A car traveling at 20 m/s collides with a wall and comes to a complete stop.
A rubber ball rolling across a floor loses kinetic energy as it moves further and further away from the wall.
A ball thrown back and forth between two walls follows an elastic collision pattern.
In an inelastic collision, the total kinetic energy is not conserved, and the objects' velocities after the collision are not the same as their velocities before the collision. Instead, the kinetic energy is converted into other forms of energy, such as heat, sound, or deformation of the objects.
Examples:
When a baseball hits a wall, the ball's kinetic energy is completely transferred to the wall. This causes the wall to deform slightly.
When a car crashes into a tree, the car's kinetic energy is converted into heat and the tree's kinetic energy.
When a rubber band is stretched and then released, it has a lot of kinetic energy, but after it breaks, most of this energy is lost as heat.
Key differences between elastic and inelastic collisions:
| Feature | Elastic Collision | Inelastic Collision |
|---|---|---|
| Total kinetic energy | Conserved | Lost |
| Object's velocities after the collision | Same as before the collision | Different from before the collision |
| Examples | Car stopping at a wall, rubber ball rolling back and forth | Car crashing into a tree, ball breaking when released |