Impulse is the effect of a force acting on an object for a short period of time. It tells us how much the momentum of the object has changed.

Impulse = Force × Time

Impulse is also equal to the change in momentum of an object.

J = Δp = m(v−u)

Where:

• m is mass of the object

• u is initial velocity

• v is final velocity

• Δp is change in momentum

Imagine you're playing football:

• When you kick the ball, your foot applies a force for a short time.

• This changes the ball's momentum — that’s impulse!