- #1

ediggity

- 6

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## Homework Statement

This isn't a homework question, but I thought this would be the appropriate place for the thread.

I am having trouble explaining Newton's Laws to my friend. His confusion lies in the fact that the second Law F=ma does not equate to the sum of Forces in The third Law.

Ex. A bus, and a mosquito

The mosquito and the bus collide, the Force of the bus on the mosquito is equal to the force of the mosquito on the bus. I tried to tell him they are equal.

He seems to think that if (and these are totally made up numbers)

Mb=100mg

ab=4m/s^2

mm=.2mg

am= .5m/s^2

then Mb(ab) =/= - mm(am), so the third Law is incorrect.

## Homework Equations

F=ma

F=-F

## The Attempt at a Solution

I tried to explain the conservation of momentum for inelastic and elastic crashes, but he doesn't want to hear it.

Does anyone have any ideas of how I can explain the third law using his not equal example? Thanks for the help in advance.