An eraser of 5N is pressed against a paper to erase a line of measure 3cm. Find the force when its constant
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Answer:
The minimum force required to move the eraser is 4 N
Explanation:
The weight of the eraser is w=2 N along negative y-axis
The force applied perpendicular to the black board is F=5 N is along positive x-axis
The coefficient of friction is
The frictional force acts between the eraser and the black board is along negative y-axis
The normal reaction N is along the negative x-axis
The minimum force required to move the eraser is along positive y-axis
The normal reaction N=F=5 N
The frictional force is
Balancing equation along y-axis we have,
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