Question

Please help!

Peter is pushing the rock but the rock is not moving. Choose the statement that describes the force(s) being applied in the image.

a boy pushing a rock, but the rock is not moving

The force of the push is an unbalanced force.
The forces acting on the rock are balanced.
A weaker force of pushing would result in unbalanced forces.
The force of gravity is pulling the rock upwards.

Answer 1

The answer is that the forces acting on the rock are balanced.

Explanation: Basically since the object is not moving we can consider this system to have a net force of zero (where are forces are balanced). In this problem, the force applied equals the static friction pushing back, and the force of gravity equals the normal force exerted by the ground on the rock.