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A 5.0-kg block rests on a 30° incline. The coefficient of static friction between the block and the incline is 0.20. How large a horizontal force must push on the block if the block is to be on the verge of sliding
(a) up the incline and
(b) down the incline?

Answer :

Answer:

43.1 N and 16.6 N

Explanation:

Resolving weight in components along and perpendicular to inclined plane

Also resolving force in two components along inclined plane and perpendicular to plane and choosing correct direction of force of friction solution is obtained .

for detailed calculation see attachment:

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