Lesson: Force as Rate of Momentum Change

In this lesson, we will learn how to relate the rate of change of momentum of an object to the force acting on it, using the formula ∆p = Ft.

Video

15:38

Sample Question Videos

03:34
05:00
02:07

Worksheet: 14 Questions • 5 Videos

Q1:

A car has an initial momentum of 1 500 kg⋅m/s when the driver starts to speed it up, changing its momentum to 1 750 kg⋅m/s in a time of 0.75 s. Determine the average force that acts on the car’s wheels while it accelerates. Answer to the nearest newton.

Q2:

An object with an initial momentum of 20 kg⋅m/s is acted on by an average force of 2.5 N and comes to rest. For how long does the force act on the object?

Q3:

An object is decelerated by an average force of 15 N for a time of 0.5 s. What is the change in the object’s momentum?

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