An object with a mass of #5 kg# is on a surface with a kinetic friction coefficient of # 4 #. How much force is necessary to accelerate the object horizontally at # 3 m/s^2#?

1 Answer
May 28, 2017

Answer:

The force is #=211N#

Explanation:

The normal reaction is #N=mg=5g#

The frictional force

#F_f=mu_k.N#

#F_f=4*5g=20g#

Let the force necessary to accelerate the object be #F#

Then,

#F-F_f=m*a#

#F=F_f+m*a#

#=20g+5*3#

#=211 N#