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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.
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.
View Answer
The correct option is (i) P experiences a net force and Q does not.
On P, the two opposite forces (5 N and 4 N) are unequal, leaving a net force of 1 N. Q moves at constant velocity, so its net force is zero.
Block P
Block Q
5 N right, 4 N left — unequal and opposite
Moving with a
constant velocity
Net force = 5 − 4 =
1 N
to the right
Constant velocity ⇒ net force =
0
P
does
experience a net force
Q does
not
experience a net force
⇒ correct option is
(i)
P experiences a net force and Q does not
