# How Do I Squash a Cockroach?

## Do you like to step on cockroaches?

0 vote(s)
0.0%

0 vote(s)
0.0%
3. ### :bigscream:

0 vote(s)
0.0%
1. Mar 19, 2014

### z.js

Alright, so it goes like this: you see A Cockroach strolling in the Kitchen. So you go up right in front of the Oven where The Cockroach is and prepare to step on it.(:yuck:) But wait()! Newton's Third Law of Motion won't have it! The Cockroach would exert an equal and opposite Force on your Foot, thus being invincible.().
My physics book said something about this: the equal opposing forces act on different objects. But how does it apply to this situation? Does the floor also exert a force?

2. Mar 19, 2014

### A.T.

Yes
No. Equal force doesn't mean equal acceleration (when different masses are involved), or equal damage (when different materials are involved). The force needed to squash a cockroach is tiny, so the equal-opposite force merely causes a negligible deceleration of your leg, but is not sufficient to stop it.

But try to squash a lego brick with you bare foot.

3. Mar 21, 2014