Question

which of following is not an application of conservation of momentum ? *

1 point

(a) while firing bullet , gun must be held tight to the shoulder

(b) a rocket explodes on midway from the ground

(c) when man jumps from boat to the shore

(d) none

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Answer 1

Answer:

C

when man jumps from boat to the shore

Answer 2

All the given statements are the application of conservation of momentum. Thus, the correct option is (d) none.

Explanation:

• When a bullet is fired, the gun gets recoiled. The recoil of the gun conserves the momentum. It is advised to hold the gun tight to the shoulder to avoid getting hurt due to the recoil force.
• Initially, both the gun and the bullet are at rest, so the total momentum before firing is zero.
• When the gun is fired, the bullet moves in the forward direction. No external force is applied to the system.
• To conserve the momentum, the total momentum after firing must also be zero.
• This can happen only if the gun recoils in the backward direction with the same momentum as that of the bullet. Thus, it is an application of conservation of momentum.
• Similarly, when a rocket explodes midway from the ground, no external force is applied. Thus, the total momentum of the system is conserved.
• Also, when a man jumps from the boat to the shore, no external force is applied. Therefore, the total momentum in this system is also conserved.
• Hence, none of the given applications can be said not to be an application of conservation of momentum.