Question

a body of mass 4kg placed in horizantal surface normal reaction is​

Answer 1

Explanation:

Static friction is a self-adjusting force.

The limiting value of friction up to which the body stays at rest till it starts moving is given by, F

s

=μmg

where μ is the coefficient of static friction.

Below that limit, the frictional force is equal to the force applied.

Here F

s

=0.8×4×10=32N ; g=10m/s

2

Whereas force applied is 19N less than the limiting value of friction.

Hence Frictional force is 19N.