117 Lazy Ball vs Bouncy Ball

Capture.GIF

For the lazy ball, its momentum changed from mv to 0. So the lazy ball’s momentum changed by mv towards the right.  The impulse exerted by the blocks on the lazy ball is thus mv. By Newton’s 3rd Law, the impulse exerted by the lazy ball on the blocks is also mv.

Capture.GIF

For the bouncy ball, its momentum changed from mv to –mv. So the lazy ball’s momentum changed by 2mv towards the right. The impulse exerted by the blocks on the lazy ball is thus 2mv. By Newton’s 3rd Law, the impulse exerted by the lazy ball on the blocks is also 2mv.

The fact that the bouncy ball underwent a larger change in momentum implies that a larger impulse between the ball and the blocks. That’s why a bouncy ball delivers more “punch”.

One thought on “117 Lazy Ball vs Bouncy Ball

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s