For problems that involve an object accelerating along an inclined plane, how can the weight be used to determine the force component that causes motion?

Resolve the object's weight, mg, into components parallel and perpendicular to the ramp. If the ramp makes an angle θ with the horizontal, the component down the ramp is mg sin θ, while mg cos θ is perpendicular to the ramp. Therefore, the correct choice is “The weight times the sine of the angle of the ramp acts down along the ramp.”

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