WEBVTT

1
00:00:00.000 --> 00:00:05.689
Here is the problem: What is the momentum of a 2 kg object moving at 12 m/s?

2
00:00:06.139 --> 00:00:10.771
Use the momentum formula, rearranged for the unknown, in SI units.

3
00:00:11.571 --> 00:00:12.987
Formula: momentum.

4
00:00:13.437 --> 00:00:15.364
Substitute the known values.

5
00:00:16.164 --> 00:00:21.400
So the answer is momentum p equals 24 kg times m/s.

6
00:00:21.850 --> 00:00:36.583
Momentum is a vector with the same direction as the velocity; in one dimension the sign shows the direction. A 1000 kg car at 20 m/s and a 10 kg ball at 2000 m/s carry the same momentum.

7
00:00:37.383 --> 00:00:43.084
Substituted every value back into the formula: both sides agree, which checks out.