# Shared Flashcard Set

## Details

Rotational Motion ch.7 & ch.8
Equilibrium & Dynamics
20
Physics
12/03/2006

Term
 Angular Displacement
Definition
 the angle through which a rigid object rotates about a fixed axis. Positive rotation = counterclockwisenegitive rotation = clockwise
Term
Definition
 the SI unit fo angular displacement. It equals to the central angle whose base is equal to a radius of a circle. magnitude of one radian equals 57.3 degrees.
Term
 Angular velocity
Definition
 rate of an angular displacement. ANd angular speed si a magnitude of an angular velocity.
Term
 Tangential distance
Definition
 the length of a circular path traveled by an object during a circular motion
Term
 Tangential velocity
Definition
 tangential component of an instataneous velocity of an object.
Term
 Period of Rotation
Definition
 the time that is necessary for an object to complete one revolution around the moving object
Term
 Revolution
Definition
 one full rotation
Term
 Uniform circular motion
Definition
 hte motion fo an object traveling in a circular path at a constant speed
Term
 centripetal force
Definition
 the net force that keeps and object in a circualr path. This net force is directed toward the center of a circular path.
Term
 Centripetal acceleration
Definition
 the acceleration that an objectmust have to stay in a circular path. ( it is always directed towards the center of the circualr path
Term
 Newton's universal law of gravitation
Definition
 relation between a gravitational force and masses of objects participathing in a gravitational interaction and also between a gravitational force and a distance between these objects.
Term
 Gravitational constant 6.67x10^-11
Definition
 the coefficient of a proporitionality in the law of gravity. it equals a magnitude of a gravitional force between two like objects fo 1 kg mass each
Term
 orbital motion
Definition
 motion of planets of satellites along a closed path under the action of gravity
Term
 Satellite's orbital speed
Definition
 the tangential speed of a satellite during it's orbital motion
Term
 torque
Definition
 a vector physical quantity thatt characterizes the tendency of force acting on a rigid object to totate this object around a pivot or an axis fo rotation. ( the magnitude of torque equals a product of force times a lever arm
Term
 lever arm
Definition
 the shortest distance between a pivot and a line of action of the force. IT's equal to the length fo a perpenrdicualr dropped form a pivot on the line of action of the force.
Term
 LINE OF THE ACTION
Definition
 a line drawn collinear with a force
Term
 Rotational equilibrum
Definition
 the type of equilibrium of an object having the axis of rotation. When an object is in totaionl equilibrum its net torque equals zero.
Term
 Center fo Gravity
Definition
 the imaginary point associated with an object where the gravitational force si considered to act
Term
 Center of mass
Definition
 imaginaty point associtaed with an object where it's mass can be considererd to be concentrated
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