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 would be your answer which is B

Answer 2

A = force by which levi push the box = 30 N

B = force by which clara pulls the box = 50 N

f = frictional force acting on the box = 65 N

the pushing and pulling forces acts in same direction and the frictional force acts in opposite direction. hence the net force is given as

Net force = Sum of pushing and pulling force - frictional force

Net force = 30 + 50 - 65

Net force = 15 N

hence the correct choice is

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