# An object with a mass of 12 kg is on a surface with a kinetic friction coefficient of  1 . How much force is necessary to accelerate the object horizontally at  4 m/s^2?

Feb 19, 2016

ans- 129.6 N

#### Explanation:

The gravitational pull on the body kept on horizontal surface is
w = mg =12x9.8 N
so normal reaction = 12x9.8 N
kinetic friction = $\mu m g$ =1x12x9.8 N
net force acting on the body with acceleration 4 $m {S}^{-} 2$ overcoming this frictional body is
F= ma = 12x4 N
Then the applied force should be= ma+$\mu m g$ =(12x4+1x12x9.8) N
= 129.6 N