Question

a block of mass 2 kg is placed in a floor where mu= o.4 .a horizontalforce of 7 N is applied on the block .the force of friction between the block and floor is

Answer 1

a block of mass 2 kg is placed in a floor where mu= o.4 .a horizontalforce of 7 N is applied on the block .the force of friction between the block and floor is...

answer : 7N

solution : given, mass of block, m = 2kg

acceleration due to gravity, g = 10m/s² [ experimental data ]

Normal reaction between acting on block = mg = 2 × 10 = 20N

so, static friction will be , fr = uN

= 0.4 × 20 = 8N > 7N ( applied horizontal force)

here static friction force is greater than applied horizontal force. it means, body doesn't move from its position. so,frictional force = applied horizontal force.

i.e., force of friction between the block and floor is 7N