Conservation Laws | MCQs

Explanation

Explanation

Explanation

• Energy
• Momentum
• Charge

Explanation

The principle of conservation of linear momentum is a direct consequence of Newton's Third Law of Motion.

While Newton's Second Law relates force to the rate of change of momentum (F = dp/dt),

It's the reciprocal action-reaction nature described in the Third Law that leads to the preservation of total momentum in an isolated system. 

Explanation

Impossible Situation:

Constant velocity requires zero acceleration (Newton’s First Law).

Variable acceleration would imply a changing net force, which must alter velocity (contradicting "constant velocity").

Possible Situations:

Zero velocity, non-zero acceleration:

Example: A ball at the top of its vertical toss (v=0, a=9.8 m/s² downward).

Velocity east, acceleration west:

Example: A car moving east while braking (deceleration acts west).

Velocity east, acceleration east:

Example: A car speeding up in the east direction.

Explanation

If the mass is doubled, both angular and linear momentum will be doubled according to the conservation of momentum principle.