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Lesson: Relativistic Momentum Physics

In this lesson, we will learn how to calculate the relativistic momentum of massive objects moving relative to an observer.

Lesson Plan

Students will be able to

use in all permutations,
use units of for masses,
interpret graphs of against .

Lesson Worksheet

Q1:

The graph shows how the relativistic momentum of an object varies with speed. The -axis shows the speed as and the -axis shows the momentum, , divided by the speed of light, . Use the formula to find the rest mass of the object.

Q2:

An object is traveling at ‎ of the speed of light in a frame . The object has a rest mass of 2 kg. How much greater is the relativistic momentum of the object than the classical momentum of the object? Give your answer to 3 significant figures.

Q3:

At what speed is the relativistic momentum of an object equal to twice its classical momentum? Give your answer to 3 significant figures.