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# CircularMotion

### Circular Motion

TermDefinition
centripetal force force of object toward center of a circle that causes object to move in a circle
centripetal acceleration acceleration of object toward the center of a circle, speed constant while direction changes
uniform circular motion speed is constant (does not speed up or slow down); speed's direction changes; object experiences a centripetal acceleration
tangential velocity velocity tangent to the circular motion; perpendicular to centripetal force
Newton's Law of Universal Gravitation Objects attract other objects with a force that is directly proportional to the product of their masses, and inversely proportional to the square of the distance between them.
gravitational constant G in the gravitational force equation; units: N m^2 / kg^2
universal gravitational force gravitational force is proportional to the inverse; square of the distance between two objects the greater the mass, the larger the gravitational force; r is the distance between the center of mass of two objects
weightlessness lack of normal force
torque measure of a forces tendency to rotate an object around an axis torque increases as lever arm length increases; units: N m
lever arm distance between force and pivot point; the longer the lever arm, the greater the torque
rotational equilibrium the object does not rotate; the sum of the torques equals zero
center of mass the point where all the mass is concentrated. When an object is supported at its center of mass there is no net torque acting on it
orbit gravity is the centripetal force that causes orbit; objects in orbit are constantly falling; requires a very large mass for an object to gravitationally orbit it
Created by: pnesrsta