[Daily Question] Theoretical Basis 2020.02.06
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This post was last edited by Qingse Nianhua on 2020-2-6 16:08.: A block of weight W is freely placed on an incline with an inclination of a as shown in the figure, and sina=3/5, cosa=4/5. A horizontal force F acts on the block, and F = W. If the static friction coefficient between the block and the incline is μ = 0.2, then the state of the block is (). A. Stay still B. Up the slope C. Down the slope D. Unable to determine the answer: A tip: Those who can explain the problem-solving process will be given extra rewards, and the answers will be visible in the replies!
A. 1. The upward force of F and W along the inclined surface is (0.8-0.6) * F=0.2F 2. Static friction: (0.8+0.6)F * 0.2=0.28F because the static friction force > the upward force on the inclined surface
A. 1. The upward force of F and W along the inclined surface is (0.8-0.6) * F=0.2F 2. Static friction: (0.8+0.6)F * 0.2=0.28F because the static friction force > the upward force on the inclined surface