31. A massive block was pulled at an angle of 30° in a horizontal rough surface by a force of magnitude F enough for the block to move. If we set the +x-axis at the right, which of the following statements is true about the forces acting on the block? 30⁰ F rough A. The direction of the frictional force experienced by the block is to the left. B. The normal force's direction is 30° above the +x-axis. C. The block will not experience friction since F is just enough to move the block. D. The direction of the weight of the block is about 210° from the x-axis.

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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!