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# What is rotary motion?

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Rotary motion, also referred to as rotational motion or circular motion, is physical motion that happens when an object rotates or spins on an axis. This type of motion is analyzed in much the same way as linear motion.

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Whenever an object is referred to as having uniform rotary motion, or uniform circular motion, this means that the object's speed and direction of motion is unchanging. Objects can have variations in their rotary motion, however. For example, inertia can influence rotary motion in certain ways.

The inertia of an object is its resistance to changes in its rotational motion. Objects that have lots of inertia will require much more energy to change their velocity or their position on the axis of their rotation.

Inertia is important to understanding rotary motion because it helps to explain why objects that have rotational motion behave the way they do. For example, a bicycle wheel that is very heavy will require more force to turn it than a bicycle wheel that is very light. The heavy wheel has more inertia, so it will be more resistant to a an increase in its velocity than the lighter wheel.

Inertia also helps explain changes in position on the object's rotational axis. Another simple example of this phenomena in action can be explained through bicycle wheels. When someone sits on a bicycle that is not moving at all, it can be incredibly hard for the person to maintain his or her balance. That's because the wheels aren't rotating at all, so there isn't much inertia there to resist changes to position. If someone is moving on the bicycle, however, the rotating wheels have much more inertia, so the wheels will naturally resist changes to their upright position, so the person is much less likely to lose his or her balance.

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## Related Questions

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The law of inertia states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. The law of inertia is sometimes referred to as Newton's first law of motion.

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Unbalanced force occurs when two forces acting on an object are not equal in size, causing a change in motion. Unbalanced forces cause a still object to move or moving objects to slow down or speed up, stop or change direction.

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Kinetic energy is used by exploiting the motion of an object. For example, the energy of a moving piston in an automotive engine provides transportation. The kinetic energy of moving water powers hydroelectric dams that provide electricity.