The diagram below shows a light plank balanced on two supports, A and B. Weights of 50 N, 25 N and 30N are placed on the plank as shown. X and Y are the normal reactions to the supports. Y 50 N. 25 N 30 Ν 5 cm 15 cm 15 cm 15 cm 20 cm 20 cm B A The reaction force X is N The reaction force Y is N The turning moment of the 30N weight about support B (in an anticlockwise direction) is Nm.

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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!