Laws of Motion and Friction: Friction on Incline — Equilibrium MCQ

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Friction on Incline — EquilibriumMediumQuestion 30241

Question

A block of mass 8 kg is on an incline (θ = 30°). μₛ = 0.5. Is the block in equilibrium? (g = 10 m/s²)

A
No, it slides down
Correct
B
Yes, static friction is sufficient
C
It moves up the incline
D
Impossible to determine

Correct answer

No, it slides down

Explanation

The required friction is $mg\sin30°=40$ N, while the maximum static friction is $μ_smg\cos30°≈34.6$ N. Because the required force is larger, the block slides down.

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