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Q. 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

Delhi UMET/DPMTDelhi UMET/DPMT 2011Laws of Motion

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 is opposite value of the present force.
So that the frictional force between the object and the surface is $-10\, N$.