Lesson: Chapter - 11

Circular Motion and Gravitation

In physics, circular motion is a movement of an object along the circumference of a circle or rotation along a circular path.

Video Lesson - What is Gravity

Newton’s first law tells us that objects will move in a straight line at a constant speed unless a net force is acting upon them.

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That rule would suggest that objects moving in a circle—whether they’re tetherballs or planets—are under the constant influence of a changing force, since their trajectory is not in a straight line. We will begin by looking at the general features of circular motion and then move on to examine gravity, one of the principal sources of circular motion.

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