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- What is the difference between elastic and inelastic collisions?
- Elastic and Inelastic Collisions
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A perfectly elastic collision is defined as one in which there is no loss of kinetic energy in the collision. An inelastic collision is one in which part of the kinetic energy is changed to some other form of energy in the collision. Any macroscopic collision between objects will convert some of the kinetic energy into internal energy and other forms of energy , so no large scale impacts are perfectly elastic. Momentum is conserved in inelastic collisions, but one cannot track the kinetic energy through the collision since some of it is converted to other forms of energy. Collisions in ideal gases approach perfectly elastic collisions, as do scattering interactions of sub-atomic particles which are deflected by the electromagnetic force.

A collision is an event where momentum or kinetic energy is transferred from one object to another. The other quantity that can be transferred in a collision is kinetic energy. The relationship between kinetic energy and mass is linear, which means that a vehicle massing twice as much has twice as much kinetic energy. The relationship between kinetic energy and velocity is exponential, which means that as you increase your speed, kinetic energy increases dramatically. There are two general types of collisions in physics: elastic and inelastic. An inelastic collisions occurs when two objects collide and do not bounce away from each other.

An elastic collision is a collision where there is no loss of kinetic energy. Therefore, it can be said that, since KE is conserved, momentum is conserved. In other words the momentum and total kinetic energy before and after the collision are the same. An example of an elastic collision is the movement of swinging balls. Whereas, in an inelastic collision some kinetic energy is changed to another form of energy such as heat or sound.

We have seen that in an elastic collision, internal kinetic energy is conserved. An inelastic collision is one in which the internal kinetic energy changes it is not conserved. This lack of conservation means that the forces between colliding objects may remove or add internal kinetic energy. Work done by internal forces may change the forms of energy within a system. For inelastic collisions, such as when colliding objects stick together, this internal work may transform some internal kinetic energy into heat transfer. Or it may convert stored energy into internal kinetic energy, such as when exploding bolts separate a satellite from its launch vehicle.

For elastic collisions , kinetic energy is conserved, whereas for inelastic collisions it is not. For an elastic collision, the total kinetic energy before the collision ie the sum of the kinetic energies of all the bodies participating in the collision is equal to the total kinetic energy after the collision. For an inelastic collision, the total kinetic energy before the collision ie the sum of the kinetic energies of all the bodies participating in the collision is not equal to the total kinetic energy after the collision. This does not violate the Law of Conservation of Energy , since, although Mechanical Energy is "lost" from the system, it is converted into an equivalent amount of other forms of energy, eg heat, sound, light, deformation, etc. In real-life, all collisions are inelastic.

*Despite velocity being a vector, kinetic energy is a scalar quantity and therefore will never include a minus sign. This is because in the kinetic energy formula, mass is scalar and the v 2 will always give a positive value whether its a negative or positive velocity. Although kinetic energy may not always being conserved, remember momentum will always be conserved.*

Elastic collision is a type of collision in which the total kinetic energy is conserved. What this means is that, the total kinetic energy of the colliding bodies after collision is equal to their kinetic energy before collision. In a perfectly elastic collision, there is no net conversion of kinetic energy into other forms such as heat, noise or mechanical energy. During collision of small objects, kinetic energy is first converted to potential energy associated with a repulsive force between the particles, and then this potential energy is converted back to Kinetic energy. Examples of elastic collision include: collision in ideal gases, collision of atoms, neutron-nucleus scattering reaction, and collision of billiard balls etc.

* - Разница между U235 и U238.*

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## 1 Comments

## Nevio S.

Elastic collision is whereby two colliding objects do not stick together; they bounce back without undergoing any deformation or heat generation. Inelastic collision is a kind of collision whereby the two colliding objects stick together and move with the same post-collision speed.