Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard. The reason he doesn't slip off the skateboard is due to

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Quizplus · Accepted Answer

The only force that keeps Freddy Frog from sliding off the skateboard is friction between his feet and the board. This is because there is no other force acting upon him in the horizontal direction. Inertia in motion and momentum change are not relevant forces in this scenario.

Freddy Frog Drops Vertically from a Tree onto a Horizontally-Moving