Two linemen are pushing on the same football sled from the same side and at the same height.  One pushes with 50N and the other pushes with 70N.  Draw each idealized force vector and show how you would add them together.  What is the net force on the sled (ignore friction)?

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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!