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#?

1 Answer
P dilip_k
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 = #mumg# =1x12x9.8 N
net force acting on the body with acceleration 4 #mS^-2# overcoming this frictional body is
F= ma = 12x4 N
Then the applied force should be= ma+#mumg# =(12x4+1x12x9.8) N
= 129.6 N

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