Stand on a footstool with your right leg close to the edge of the footstool and your left leg hanging off the footstool with a cuff weight around the ankle. The force through the right lower extremity is approximation/traction, and the force through the left lower extremity is approximation/traction. Underline the correct answers.

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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!