Lesson: Momentum

In this lesson, we will learn how to use the formula for momentum, p = mv, to calculate the momentum of objects and calculate changes in an object's momentum.

Video

07:36

Sample Question Videos

05:07
05:42

Worksheet: 17 Questions • 2 Videos

Q1:

A bag of mass 1.5 kg is being carried horizontally at a velocity of 1.2 m/s when it opens and 0.25 kg of its contents spill out vertically. The person holding the bag does not immediately notice what has happened and, for a short time, they continue to move horizontally at the same speed.

What is the horizontal momentum of the bag after it opens and the contents are spilled?

What is the horizontal momentum of the spilled contents?

Q2:

A child of mass 30 kg slides down a slide. Near the top of the slide, the child’s velocity is 0.65 m/s, while near the bottom of the slide, the child’s velocity is 1.35 m/s. How much does the child’s momentum change between these two positions?

Q3:

A van that has a mass of 750 kg increases its momentum by 18 750 kg⋅m/s when it accelerates at a constant 2.5 m/s². For how long does the van accelerate?

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