Question

A body of mass 2kg is kept by pressing to a vertical wall by a force of 100N . The coefficent of friction between wall and body is 0.3 . Then the frictional force is equal to
A)6N
B)20N
C)600N
D)700N​

Answer 1

Answer:

20 Newton.

Explanation:

We will get the downward force or the weight of the given body will be = m g = 2×9⋅8=19⋅6 Newton (where m is the mass of the body and g is the acceleration due to gravity).

Therefore, the frictional force which is acting on the body will be given as f=19⋅6×0⋅3=5⋅88 NF=19·6×0·3=5·88 N (where N is the normal reaction force given on the wall by the body and the coefficient of friction is 0.3).

Now, since the force is lesser than the applied force hence the frictional force will be 19.6 or approximately 20 Newton.

Answer 2

Answer:

20N

Explanation:

f=mu*N

N=mg

N=20

f=6N

applied force=100N(greater than friction force)

f=mg

f=20N