p and q on a smooth horizontal surface – Discussion Forum

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Sonal Chauhan

Asked: September 16, 2026In: Class 9 Science

Two blocks P and Q on a smooth horizontal surface are shown in Fig. 6.36a and Fig. 6.36b. 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? (i) P experiences a net force and Q does not experience a net force. (ii) P does not experience a net force and Q experiences a net force. (iii) Both P and Q experience a net force. (iv) Neither P nor Q experiences a net force.

Option (i) is correct because block P experiences an unbalanced net force of 1 N towards the right, while block Q moves at constant velocity, meaning the net external force acting upon Q is zero.