A block of mass m = 2 kg is being pushed towards a wall with a force of magnitude F 20 N at an angle 30°, as shown in the figure. The static friction coefficient between the block and the wall amounts to flg = 0.7. = = Draw a free body diagram indicating all forces acting on the block and, if necessary, their relevant components. Choose a meaningful coordinate system. What is the magnitude of the maximal possible static friction? Is force F strong enough, to prevent the block from sliding down the wall? Find the angle, at which the force F applied to prevent the block from sliding, is minimal.

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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!