Question

For a system to follow the law of conservation of linear momentum during a collision , the condition is a) total external force acting on the system is zero b) total external force acting on the system is finite and time of collision is negligible c) total internal force acting on the system is zero options - A) (a) only B) (b) only C) (c) only D) (a) or (b) pls only say the answer ... needed only direct option

Answer 1

Answer: (option A) i.e. total external force acting on the system is zero

Hope it helps!

Answer 2

Answer:

Option 'A' is the correct option.

Explanation:

From Newton's second law of motion , rate of change of linear momentum (p) is equal to the applied external force (F)

dp/dt = F

If the total external force acting on the system is zero, then

F=0

Thus, we have

dp/dt = 0

=> p is a constant.

This shows that the law of conservation of linear momentum during a collision is followed in the absence of total external force.

Thus, only A is correct.

If total external force is finite, linear momentum of the system will not be conserved.

Hence, (ii) is not correct.

Also, conservation of linear momentum of the system has nothing to do with internal force acting on the system. Even if internal force exists within the system linear momentum of the system is conserved.

Hence, option 'A' is the correct option.