In Problem, the angle of the incline is increased to 25°. Find the magnitude and direction of the force of friction when the coin is (a) sliding upward initially and (b) sliding back downward later.
Problem
A 14-g coin slides upward on a surface that is inclined at an angle of 18° above the horizontal. The coefficient of kinetic friction between the coin and the surface is 0.23; the coefficient of static friction is 0.35. Find the magnitude and direction of the force of friction (a) when the coin is sliding and (b) after it comes to rest.
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