[Daily Question] Theoretical Basis 2020.02.03
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Multiple choice questions: A block weighs W=100N and is placed on an incline with an inclination of 60°. As shown in the figure, the force parallel to the incline is P=80N. If the static friction coefficient μ=0.2 between the block and the incline, the friction force on the block is ( )N. A.10 B.20 C.6.6 D.100 Answer: C Tips: Those who can explain the problem-solving process will be given extra rewards, and the answers will be visible in the replies!
A, f=μN=0.2×100×cos60=0.2* 100 * 0.5=10N.