An object weighing √3kg is placed on a horizontal rough plane as shown in the figure.  A force F is applied to the bottom so that it is oblique 30° horizontally.  The maximum value that can be applied to the force F to keep the object motionless is (the coefficient of friction between the object and the plane is 0.5). 1)10N 2)12N 3)15N 4)180N 5)20N

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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!