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## Homework Statement

A tractor is pulling a heavy weight behind it by a rope. If, according to Newton's third law, the load is pulling back as hard as the tractor is pulling forward, then why does the tractor move?

Something else I don't really get:

A fishline will break when a force of more than 600n is exerted on it. Two people pull on the line in opposite directions with a force of 400n each. Will the line break?

## Homework Equations

## The Attempt at a Solution

For the first question, I assume that if the tractor moves forward with a force of 100n, the weight will just pull back 100n, canceling out any movement.

For the second question....I don't even know how to start

Any help or suggestions would be appreciated, and thx in advance =D