Physics in the Real World
RealWorld Applications
In a collision, an object experiences a force for a given amount of time that results in its mass undergoing a change in velocity (i.e., that results in a momentum change).
There are four physical quantities mentioned in the above statement  force, time, mass, and velocity change. The force multiplied by the time is known as the impulse and the mass multiplied by the velocity change is known as the change in momentum. The impulse experienced by an object is always equal to the change in its momentum. In terms of equations, this was expressed as
This is known as the impulsemomentum change theorem.
In this lesson, we will examine some realworld applications of the impulsemomentum change theorem. We will examine some physics in action in the real world. In particular, we will focus upon

the effect of collision time upon the amount of force an object experiences, and

the effect of rebounding upon the velocity change and hence the amount of force an object experiences.
As an effort is made to apply the impulsemomentum change theorem to a variety of realworld situations, keep in mind that the goal is to use the equation as a guide to thinking about how an alteration in the value of one variable might effect the value of another variable.