Three control rods attached to a lever ABC exert on it the forces shown. (a) Replace the three forces with an equivalent force- couple system at B. (b) Determine the single force that is equiva- lent to the force-couple system obtained in part a, and specify its point of application on the lever. 216 N -55 450 mm 600 mm 90 N 20° 30° 20° 90 N B A

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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!