First slide

Third law

Question

Assertion Even though net external force on a body is zero, momentum need not to conserved.
Reason The internal interaction between particles of a body cancels out momentum of each other. [AIIMS 2019]

Easy

A

Both Assertion and Reason are true and Reason is the correct explanation of Assertion
B

Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
C

Assertion is true, but Reason is false.
D

Both Assertion and Reason are false.

Solution

By Newton's second law of motion, net external force applied on a system is equal to rate of change of momentum.
i.e. $F_{ext} = \frac{d p}{d t}$
If $F_{ext}$ = 0, then $\frac{d p}{d t}$ = 0 $\Rightarrow$ p = constant
i.e. When $F_{ext}$ = 0, then momentum of the system remains conserved.
The internal interaction between particles of a body do not contribute to change in total momentum of body.
Hence, both Assertion and Reason are false.

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