3fde62fa_n_of_Inquiry__Labs_in_Volume_2__Counting_Clips
We use numerical modeling to study collisions in detail. Here is the sketch of a cool extension where you drop stuff that's hanging from a force sensor by a string and see the impulse when it "bounces" as the string extends to full length. [Counting Clips] 
Impulse: The Physics of Crashing and Bouncing
A Den of Inquiry: Labs in Volume 2
Counting Clips