Two otters slide down frictionless hillsides of the same height but different slopes. The slope of the hill of otter 1 is 30°, while the slope of otter 2 is 60°. If both start from rest, which otter is moving faster when she reaches the bottom of her hill?  A) otter 1 faster B) otter 2 faster C) the heavier otter is faster no matter which hill used D) the otter that took the shorter time is moving faster

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.