First slide
Static friction
Question

An object is moving on a plane surface with uniform velocity 10 ms-1 in presence of a force 10 N. The
frictional force between the object and the surface is [DUMET 2011] 

Moderate
Solution

When an object moves in a plane surface with uniform velocity in the presence of a force, then the frictional force between the object and the surface has opposite value of the present force. So, the frictional force between the object and the surface is -10 N.

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