A 2000 g mass is placed on a table and is attached to a mass of 1200 g by a string. A pulley is placed at the edge of the table and the 1200 g mass is placed so that its weight pulls horizontally on the 2000 g mass.  The whole thing will move.  Use the coefficient of friction found in #4 to predict… The coefficient from #4 is 0.2 What’s the acceleration of the 1200 g mass? What’s the acceleration of the 2000 g mass? How long will it take for the 1200 g mass to descend 20 cm?

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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!