Question

Question 36:
(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.

Lakhmir Singh Physics Class 9

Answer 1

a ) Momentum is the product of mass and velocity . So , it depends on mass and velocity .

b ) U = 20 m/s

V = 0.20 m/s

m = 5 kg

Final Momentum = mv

= 5 × 0.20

= 1.00

Initial momentum = mu

= 5 × 20

= 100

Change in momentum = mv - mu

= 1 - 100

= -99 kgm/s

Answer 2

(a) We may see from the concept of momentum that this depends on the body's mass and velocity.

(b) Therefore the body's momentum change is 99 kg m / s.

Explanation:

(a)

• A body's momentum is described as the product of both its mass and its velocity.
• This is a quantity of vectors and has path the same as velocity direction.
• We may see from the concept of momentum that this depends on the body's mass and velocity.

(b) STEP:1 Body’s mass = 5 kg

Body’s Initial velocity = 20 m/s

STEP:2 Body’s initial momentum = 5 kg×20 m/s = 100 kg m/s

Body’s Final velocity = 0.20 m/s

STEP:3 Body’s Final momentum = 5 kg × 0.20 m/s = 1 kg m/s

Momentum Change = 100 kg m/s - 1 kg m/s = 99 kg m/s

Therefore the body's momentum change is 99 kg m / s.

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