A platform scale calibrated in Newtons is placed on the bed of a truck driven at constant speed of 14 m/s. A box weighing 500 N is placed on a scale. Find the reading on the scale if: a) The truck passes over the crest of a hill with a radius of curvature 100 m. b) The truck passes through the bottom of a dip with a radius of curvature 80 m

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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!