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CBSE Class 9 Answered

why value of k in f=kma is considered as 1 or rigid why it not changes
Asked by vedant sharma | 24 Nov, 2013, 12:21: AM
answered-by-expert Expert Answer
Newton's second law is given by,
 
F = kma
 
Here, k is a praportionality constant.
 
Now, the SI unit of force is defined as,
 
1N Force = Force that causes an acceleration of 1 m/s2 to a mass 1 kg
 
1 N = 1 kg.m/s2
 
This defination of 1 N force gives k =1 such that,
 
F = ma
 
Thus, for simplysity k is defined as 1.
 
Physicits consider that, system of units in which k has to be taken differnt form 1 is not consistant and it makes the calculations very difficult.
Answered by Komal Parmar | 25 Nov, 2013, 03:47: PM

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