Momentum

and Impulse

Reference - Forumla Sheet

Content Overview

Activities

Tennis Ball & Basketball - How does the tennis ball fly so high when both of the balls started out so slow? Where did the extra motion come from?

Crash Carts - Set up an experiment to collect data and predict the motion and masses of colliding carts

Magnet Cannon - Releasing a magnet sets off a chain reaction. The last magnet shoots off much further than many would have predicted. Let's explore why!

An Unbreakable Egg - Throw an egg into a bed sheet hung from the ceiling. It won't break. Try again, but harder. Same result. Let's discuss how this works.

Happy & Sad Balls - One bounces, the other does not. They feel and weigh the same, so why do they act so differently, and what are the implications?

Topics

Momentum of Collisions

Impulse - Changing Momentum & Force over Time

Students are Expected to Understand

Interactions between Objects Exchange Momentum

How to measure and calculate values related to momentum

Methods of manipulating impacts to improve the desired outcome

Some notes on Momentum

  • The combined momentum for all objects before and after collision doesn't change, we call it a Conservation of Momentum
  • Depending on the type of collision, we can change how we do the math
  • Impulse is a change in momentum over time which can be caused by a net force
  • When undergoing a change in momentum, it usually applies a large net force. To change this force, time is an important factor, and more time is taken to change the momentum, the smaller the force will be. Think of it as a big piece of butter on toast. Should we have a large chunk of it in a small spot, or should we spread out that force over time?

Additional Support

Crash Course - Collisions Khan Academy - Impacts and linear momentum The Physics Classroom - Momentum and Its Conservation

*The videos above are to be used as a supplement and are not a replacement for in-class experiences