First slide

Friction on horizontal surface

Question

A body of mass 60 Kg is pushed with just enough force to start it moving on a rough horizontal surface with µ_s = 0.5 and µ_k = 0.4 and the force continues to act afterwards. The acceleration of the body is

Moderate

A

0.98 m/s²
B

3.92 m/s²
C

4.9 m/s²
D

Zero

Solution

Minimum force to push µ_smg
and frictional force while it moves µ_kmg.
So $a = (μ_{s} - μ_{k}) g = 0.98 m / s^{2}$

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