What exactly do we mean by circular motion or rotation? Rotational motion is the circular motion of an object about an axis of rotation when an object moves in a circular path. For example, circular motions include a race car speeding around a circular curve or a toy which is attached to a string swinging in a circle or the circular loop-the-loop on a roller coaster. Other examples are a wheel turning on its axle, the spin of a tornado on its path of destruction or that of a figure skater spinning during a performance at the Olympics. We can notice that sometimes the objects will be spinning while in a circular motion like the planet Earth which is spinning on its axis while revolving around the Sun.
When we are solving problems that involve rotational motion, we use variables that are similar to linear variables such as distance, velocity, acceleration, and force. but we should notice that it takes into account the curvature of rotation of the motion. Here we define generally the angle of rotation which is the angular equivalence of distance and the angular velocity which is the angular equivalence of linear velocity.
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