Question

The magnitude of contact force is given by
a) R=N+f b) R=N2 +f2
c) R =N2 +f2
d) R=N+f​

Answer 1

r=n+f

i think so.....

if i am wrong then plz tell me

Answer 2

Explanation:

f=μF n

(μ<1)f<F n

F= F n

2 +f 2

F 2 =F n

2 +f 2

ThereforeF>F n

&F>f

(F n −f)

2 =F n

2 +f 2 −2F n

f<F n

2 +f 2 =F 2

(F n +f) 2 =F n

2 +f 2 +2F n

f>F n

2 +f 2 =F 2

Therefore,

(F n −f) 2 <F 2 <(F n +f) 2

(F n −f)<F<(F n +f)