A box with mass of 5 kg is pushed with a force of 15 N on a rough horizontal floor. Find the friction force (assume that the static friction coefficient µs=0.4 ).
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Abdul-Rahim Taysir
The mass of the box is .
Hence the weight of the box acting vertically downward is
, where
is the gravitational acceleration and
.
The normal force or the reaction force on the box acting vertically
upward is
.
Hence the frictional force opposing the motion of the box is
,
where is the friction coefficient of the surface.
In this case, .
Hence .
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