COLLISIONS

Today Topic will be on *Collision*

 When two objects collide, this is called a collision. 

In physics, a collision doesn't have to involve an accident (like two cars crashing into each other), but can be any event where two or more moving objects exert forces on each other for a short period of time. Or when a moving objects cause impact on a stationary object.

1. One ball striking another on a pool table 

2. A baseball bat hitting a ball 

3.Your fingers striking the key on the keyboard Collisions and the

Above are all example of collision

*Conservation of Momentum* 

An important theory in physics is the law of momentum conservation. This law describes what happens to momentum when two objects collide. 

The law states that when two objects collide in a closed system, the total momentum of the two objects before the collision is the same as the total momentum of the two objects after the collision. The momentum of each object may change, but the total momentum must remain the same.

The above law is what we will adopt in solving question on Collision

The two types of collision we have in physics are outline below;

 *1. Elastic collision

2. Inelastic Collision*

Another type of Collision, which can also be classify under inelastic is *completely inelastic*

n each of the above collision,  momentum is conserved.

Another term used in collision is *kinetic energy* and are describe in each of the types of Collision below; 

*elastic* - kinetic energy is conserved

 *inelastic* - kinetic energy is not conserved

 *completely inelastic* - kinetic energy is not conserved, and the colliding objects stick together after the collision.