Question

derive the third law of motion from conservation of momentum?​

Answer 1

Answer:

Explanation:

Law of conservation of momentum states that total momentum of the system remains conserved in the absence of external force.

Proof: Consider two bodies of mass m1 and m2 moving with initial velocity u1 and u2 respectively. The two bodies collide with each other for a time interval ‘t’ . The velocity after collision be v1 & v2 respectively. Let F12 be the force applied by m1 on m2 and F21 be the force applied by m2 on m1.

Momentum of mass m1 before collision = m1 u1

Momentum of mass m2 before collision = m2 u2

Momentum of mass m1 after collision = m1 v1

Momentum of mass m2 after collision = m2 v2

Answer 2

Answer:Newton's Third law motion: The third law of motion states that when one object exerts a force on another object, the second object instantaneously exerts a force back on the first. These two forces are always equal in magnitude but opposite in direction.

Explanation: