(a) Define momentum of a body. On what factors does the momentum of a

1.	(a) Define momentum of a body. On what factors does the momentum of a body depend ? (b) Calculate the change in momentum of a body weighing 5 kg when its velocity decreases from 20 m/s to 0.20 m/s.
Answer» (a) Momentum is the physical quantity which is the measure of the quantity of motion of a moving body. It depends on mass and velocity of the body. (b) Mass of body = 5 kg Velocity v₁ = 20 m/s Momentum p₁ = 20 x 5 = 100 kg.m/s Velocity v₂ = 0.2 m/s Momentum p₂ = 5 x 0.2 = 1 kg.m/s Change in momentum = p₂ – p₁ = 1-100 = -99 kg.m/s (Negative sign shows that momentum decreases)

(a) Define momentum of a body. On what factors does the momentum of a body depend ? (b) Calculate the change in momentum of a body weighing 5 kg when its velocity decreases from 20 m/s to 0.20 m/s.

Answer»

(a) Momentum is the physical quantity which is the measure of the quantity of motion of a moving body. It depends on mass and velocity of the body.

(b) Mass of body = 5 kg

Velocity v₁ = 20 m/s

Momentum p₁ = 20 x 5 = 100 kg.m/s

Velocity v₂ = 0.2 m/s

Momentum p₂ = 5 x 0.2 = 1 kg.m/s

Change in momentum = p₂ – p₁ = 1-100 = -99 kg.m/s

(Negative sign shows that momentum decreases)