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Force and Laws of Motion
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29/10/2021 4:42 pm
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(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.
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29/10/2021 4:44 pm
(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)