# What is an impulse?

###### Wiki User

###### 2015-02-12 22:06:20

It is the change of rate of momentum

Impulse is the integral of force over time, it is measured in

Newton-seconds. For instance a force of one Newton applied over one

second will change the momentum, a force of two Newton's applied

over half of a second will have a similar effect.

For rigid body collisions we take this to its limit and apply an

infinite force over an infinitesimally small time. This impulse is

equal to the change in momentum of the colliding objects. Because

we are talking about forces here, Newton's third law applies, and

the impulse on the colliding objects will be equal and

opposite.

impulse = m(vf- vi)

In simple words: Impulse- A form of fast-moving electrical

messages