一道A-Level物理题
AandBarepointsonthesamelineofgreatestslopeofaroughplaneinclinedat30°tothehorizontal.A...
A and B are points on the same line of greatest slope of a rough plane inclined at 30° to the horizontal. A is higher up the plane than B and the distance AB is 2.25m. A particle P, of mass m kg, is released from rest at A and reaches B 1.5s later. Find the coefficient of friction betweem P and the plane.
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由s=1/2 aT^2 得
加速度a=2m/s^2
又由受力分析，加速度a=gsinθ-μgcosθ
代入，解得
μ=0.339
加速度a=2m/s^2
又由受力分析，加速度a=gsinθ-μgcosθ
代入，解得
μ=0.339
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