Which of the following statements about forces is true? A force applied to the center of mass of an object may cause it to rotate When a hammer knocks a nail into wood, the force on the nail must be greater than the force on the hammerhead A B C D A helicopter hovers when the net force on the blades equals the weight of the aircraft The forces acting on two weights must be equal if they are both falling with the same acceleration

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!