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Centripetal force
A force that acts on an object moving in a circular path, directed toward the center of the circle.
Acceleration
The rate at which an object changes its velocity.
Newton's First Law
An object at rest stays at rest, and an object in motion stays in motion unless acted upon by a net external force.
Kinetic energy
The energy of an object due to its motion, calculated as 1/2 mv^2, where m is mass and v is velocity.
Potential energy
The stored energy of an object based on its position or state, often related to height in a gravitational field.