Humpback whales sometimes catch fishby swimming rapidly in a circle, blowing a curtain of bubbles thatconfuses a school of fish and traps it in a small area, where thewhales can easily catch and eat them. Suppose a 28,000-kg humpback whale swims at 2.2 m>s in a circle of radius 8.5 m. What centripetal force must the whale generate?

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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!