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A block of mass 300 g is sliding on a rough surface with an initial speed of 1.4 ms It comes to a rest after a time of 0.80 s What is the coefficient of kinetic friction?
Wiki User
∙ 15y ago
We can easily calculate that deceleration of block is a = v / t = 1.4 / 0.8 = 1.75 m/s2.
The only force acting in the plane of movement may be Ft due to friction.
Formula for Ft is Ft = Q * f, where Q is weight and f is a coefficient of friction.
Q is:
Q = m * g
Ft has also to equal Ft = m * a, so:
m * a = m * g * f
a = g * f
f = a / g
f = v / ( t * g)
For given data, f will be
f = 1.4 / ( 0.8 * 9.81) = 0.178
Wiki User
∙ 15y ago
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