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A centripetal force acts perpendicular to an object's velocity. A centripetal force causes an object to accelerate by changing direction and following a curved path. The centripetal force points towards the center of the curve, and the object's velocity is tangent to the curve. Centripetal force is not a type of force, but a role that can be played by different forces. Gravity acts as the centripetal force on orbiting objects.

Sections:
00:00 - Intro
00:23 - Orbiting objects are falling
01:49 - What is a centripetal force?
06:59 - Centripetal force is NOT a new force
07:32 - Centripetal force for a spinning yo-yo
09:59 - Centripetal and non-centripetal forces
10:37 - Real life scenario
12:20 - Why don't orbiting satellites fall to Earth?

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