Question

Two blocks P and Q on a smooth horizontal surface are shown in Fig. a and Fig. b. Two forces of magnitudes 4 N and 5 N are acting in opposite directions on block P, while block Q is moving with a constant velocity.

Which of the following statement is correct?

Options

• P experiences a net force and Q does not experience a net force.

• P does not experience a net force and Q experiences a net force.

• Both P and Q experience a net force.

• Neither P nor Q experiences a net force.

Answer 1

P experiences a net force and Q does not experience a net force.

Explanation:

Two unequal forces, 5 N and 4 N, act in opposing directions on block P. P experiences a net force since the net force on P = 5 N – 4 N = 1 N. Since Block Q is travelling at a constant speed, there is no net force acting on it and no acceleration.