# 2D Conservation of Momentum Example using Air Hockey Discs

- 1,024 views
- 1 comment

A 28.8 g yellow air hockey disc elastically strikes a 26.9 g stationary red air hockey disc. If the velocity of the yellow disc before the collision is 33.6 cm/s in the x direction and after the collision it is 10.7 cm/s at an angle 63.4° S of E, what is the velocity of the red disc after the collision? This is an AP Physics 1 topic. Want Lecture Notes?

Content Times:

0:12 The problem

1:49 Breaking the initial velocity of disc 1 into its components

3:06 Conservation of momentum in the x-direction

5:24 Conservation of momentum in the y-direction

6:26 Solving for the final velocity of disc 2 using its components

8:40 Was this an elastic collision?

12:39 Movie Character Day!

Multilingual? Please help translate Flipping Physics videos!

Next Video: Introduction to Circular Motion and Arc Length

Previous Video: Review of Mechanical Energy and Momentum Equations and When To Use Them!

Please support me on Patreon!

Thank you to my Quality Control help: Christopher Becke, Scott Carter and Jennifer Larsen

"Nombre de los vientos". Licensed under Public domain via Wikimedia Commons -