centripetal force

American  

noun

1. the force, acting upon a body moving along a curved path, that is directed toward the center of curvature of the path and constrains the body to the path.

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centripetal force British  

noun

1. a force that acts inwards on any body that rotates or moves along a curved path and is directed towards the centre of curvature of the path or the axis of rotation Compare centrifugal force

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centripetal force Scientific  

1. A force acting on a moving body at an angle to the direction of motion, tending to make the body follow a circular or curved path. The force of gravity acting on a satellite in orbit is an example of a centripetal force; the friction of the tires of a car making a turn similarly provides centripetal force on the car.

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Closer Look

In a popular carnival ride, people stand with their backs against the wall of a cylindrical chamber. The chamber spins rapidly, the floor drops out, but the riders remain pressed against the wall without falling. Although the riders may insist they stay aboard because of an outward force pushing them against the wall, the reality is the opposite: the riders are subject to an inward, or centripetal, force. As the ride spins, it forces the riders to travel in a circle. According to Isaac Newton's law of inertia, objects in motion tend to travel in a straight line at constant speed unless acted on by an external force. To make an object travel along a curved path, some force—the centripetal force—must push the object toward the center of curvature of that path. In the case of the circular path, the direction of the force is toward the center of rotation. The wall of the ride's cylindrical chamber accomplishes this by pushing the riders toward the center (with the friction between the riders and the wall holding the riders up). The force of the Earth's gravity acts as a centripetal force on orbiting objects, such as the Earth's Moon, which is constantly being accelerated toward the center of the Earth, as in free fall. The Moon has enough inertia not to plummet into the Earth but not so much that it can escape the Earth's pull, and thus it will orbit almost indefinitely.

Etymology

Origin of centripetal force

First recorded in 1700–10

Compare meaning

How does centripetal-force compare to similar and commonly confused words? Explore the most common comparisons:

• centripetal force vs. centrifugal force

Example Sentences

Centripetal force Fc is always perpendicular to the path and pointing to the center of curvature, because ac is perpendicular to the velocity and pointing to the center of curvature.

From Textbooks • Aug. 12, 2015

Centripetal force is perpendicular to velocity and causes uniform circular motion.

From Textbooks • Aug. 12, 2015

The Centripetal force of the planet itself, corresponding to the female pole of the magnet, is today the active principle in external life.

From Sex--The Unknown Quantity The Spiritual Function of Sex by McIvor-Tyndall, Alexander J. (Alexander James)

Centripetal force is spiritual attraction, and centrifugal terrestrial attraction.

From Five Years of Theosophy by Various