Static friction
Question
An eraser weighing 2N is pressed against the black board with a force of 5N. If the coefficient of friction is 0.4. How much force parallel to the black board is required to slide the eraser upwards
Moderate
Solution
Freq = w + f = 2 + µN
= 2 + 0.4 × 5 = 2 + 2 = 4N
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