Question

friction: a 55 - kg box rests on a horizontal surface. the coefficient of static friction between the box and the surface is 0.30, and the coefficient of kinetic friction is 0.20. what horizontal force must be applied to the box to cause it to start sliding along the surface?
express your answer with the appropriate units.
161.7n units
the value should be entered as a single number or in scientific notation.
no credit lost. try again.

Explanation:

Step1: 计算物体重力

根据公式\(G = mg\)（其中\(m = 25kg\)，\(g = 9.8m/s^{2}\)），可得\(G=25\times9.8 = 245N\)。

Step2: 计算最大静摩擦力

最大静摩擦力公式\(F_{f,max}=\mu_{s}N\)，在水平面上\(N = G\)，\(\mu_{s}=0.30\)，则\(F_{f,max}=0.30\times245\)。

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Answer:

\(73.5N\)