Question

A block of mass 'm' is on a rough inclined surface of inclination with the horizontal. If the angle of friction is 0, when does the block slide down the
plane with acceleration ?
(A) theta= phi
(B) theta < phi
(C) theta > phi
(D) theta less than or equal to phi​

Answer 1

Explanation:

The various forces acting on the block are as shown in the figure.

From figure

mgsinθ=f ............(i)

mgcosθ=N .........(ii)

Divide (i) by (ii), we get

tanθ=

N

f

=

N

μN

or θ=tan

−1

(μ)

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