In analyzing the forces on a halfback running with a football, a free-body diagram is drawn. If the player's entire body is the chosen free body, which of the following forces should not be drawn in the diagram? The force exerted on him by the ground. his weight the force he exerts on the ground the tension in the calf muscles

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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!