Angola 12th Grade Physics (Exame Nacional De Física) Practice Questions - Angola 12th Grade National Examination - Physics (Física - Código 123) Exam

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A block of mass 4.0 kg is placed at rest on an inclined plane making an angle of 30° with the horizontal. The coefficient of static friction between the block and the plane is μ_s = 0.60. Taking g = 10 m/s^2, sin(30°) = 0.50, and cos(30°) = 0.87, which statement correctly describes the friction force acting on the block?

The block remains stationary, and the static friction force is exactly 20 N acting up the incline. The block slides down the incline because the downhill gravitational component exceeds maximum static friction. The block remains stationary, and the static friction force is 20.88 N acting up the incline. The static friction force is zero because the block is at rest.

Correct Answer:

The block remains stationary, and the static friction force is exactly 20 N acting up the incline.

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