Determine the original velocity of the moving object. If you're working a physics problem, this quantity will be given to you. For an example, assume you have a bowling ball moving at 5 meters per second.
Determine the moving object's velocity after impact. In the example, assume the bowling ball slows down to 1 meter per second upon striking a bowling pin.
Calculate the time over which the force was transferred. Assume the bowling ball slowed to 1 meter per second over a period of 0.5 seconds.
Input these values into the equation "I = M("V/"T)," or mass times the change in velocity divided by the change in time. The equation works out to 5(4/.05), or 40. The impulse is 40 newtons.