Impulse is a measure of the change in momentum of an object. It's a vector quantity, meaning it has both magnitude and direction.

Here's the formula:

Impulse = Force x Time

Where:

* Impulse is measured in Newton-seconds (Ns)

* Force is measured in Newtons (N)

* Time is measured in seconds (s)

Key points about impulse:

* Causes change in momentum: A larger impulse results in a greater change in momentum.

* Related to impact: In collisions, the impulse is the force applied over the duration of the impact.

* Can be used to calculate force or time: If you know two of the variables (impulse, force, or time), you can solve for the third.

Example:

If you apply a force of 10 Newtons to an object for 2 seconds, the impulse is 20 Newton-seconds. This means the object's momentum changed by 20 Ns.