Just before a block starts sliding on a horizontal floor with coefficient of static…

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

Just before a

5\,\text{kg}

block starts sliding on a horizontal floor with coefficient of static friction

0.4

, the resultant contact force on the block makes an angle with the vertical. Calculate this angle. (Take

g = 10\,\text{m s}^{-2}

.) (a)

38^{\circ}

(b)

22^{\circ}

(c)

67^{\circ}

(d)

24^{\circ}