Question

Conservation of linear momentum is equivalent to

• A. Newton?s law of gravity
• B. Newton?s first law of motion
• C. Newton?s second law of motion
• D. Newton?s third law of motion

Answer 1

Answer: (B)

Newton?s first law of motion

Answer 2

The law of conservation of linear momentum states that in absence of an external force, the linear momentum of a body remains constant. And Newton?s first law states that until and unless an external force is applied a body in a state of rest will tend to be in a state of rest and body in motion will tend to keep on moving without a charge of speed and direction. In other words if a body is in a state of rest then its momentum is zero and the first law tells that the body tries to preserve its zero momentum. And when in motion (momentum ?mv?), the body tries to preserve its momentum mv again. Which is the law of conservation of momentum.