1. An orthodonist uses braces to apply forces that reposition and straighten teeth. In the figure below, the teeth on the left side need to be pushed down to line up with the teeth on the right. The braces apply equal tension forces, T1 and T2, of 20.0 N. Calculate the magnitude of the net force.

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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!