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ICSE Class 9 Answered

State Newton's second law of motion.What information do you get from it?

 

Asked by Bhasharaj | 06 Oct, 2020, 10:21: PM
Expert Answer
The rate of change of momentum of a body is directly proportional to the applied force and occurs in the direction in which the force acts. 
Thus, 
Force α Change in momentum/ time 
Hence, F α ma 
F = kma 
k =1 
Thus, 
F = ma ...(*)
Thus, Newton’s second law of motion provides a method to measure the force on a body as a product of its mass and acceleration.
From eqn (*), 
F = (mv - mu)/t 
Hence, 
If F = 0, 
v =u 
This means if the external force is zero, then the body continues to move uniformly throughout its motion.
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