Suppose you would like to drag a block of mass m across a horizontal surface (with kinetic friction coefficient µk) by pulling on a (massless) rope attached to the side of the block. You are free to pull the rope at any angle you choose. What is the minimum force you would need to pull the block at a constant velocity? Hint: there is a unique angle where the required magnitude of applied force will be smallest, and this angle will depend on µk.

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: