An object with a mass of 7 kg is on a surface with a kinetic friction coefficient of 8 . How much force is necessary to accelerate the object horizontally at 14 m/s^2?

1 Answer
Mar 17, 2018

Suppose here we will be applying externally a force of F and frictional force will try to oppose its motion,but as F>f so due to the net force F-f the body will accelerate with an acceleration of a

So,we can write,

F-f=ma

Given, a=14 ms^-2,m=7Kg,mu=8

So,f=muN=mumg=8×7×9.8=548.8 N

So,F-548.8=7×14

Or, F=646.8N