Posted by ellimac on Sunday, December 9, 2007 at 8:38pm.
I assume that the surface is horizontal. The deceleration rate is -F/M. So, the friction force is
a = -1.4/1.25 = -1.2 Newtons
The coefficient of sliding friction is muk = F/(M*g) = 1.2/(1.4*9.8) = ?
Given: m= 1.4 kg
A= -1.25 m/s2
ľk=Kinetic force/ Normal Force
Normal Force= 1.4*9.81(gravity) = 13.72 N
Kinetic force = net force
net force = ma = 1.4(-1.25) = -1.75
ľk= -1.75/13.72 = -0.13
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