Question

Levi and Clara are trying to move a very heavy box. Levi is pushing the box with a force of 30 N, and Clara is pulling the box with a force of 50 N. The box exerts a frictional force of 65 N.

Which best explains the forces?

There is a net force of 15 N against them and they cannot move the box.
There is a net force of 15 N allowing Levi and Clara to move the box.
There is a net force of 65 N against them and they cannot move the box.
There is a net force of 80 N allowing Levi and Clara to move the box.

Answer 1

There is a net force of 15 N allowing Levi and Clara to move the box.

Explanation: Their combined forward force is 30 + 50 = 80 N. Subtract the opposing friction 65 N: 80 − 65 = 15 N net forward, so the box will accelerate in their direction.