# Shared Flashcard Set

## Details

Unit 4
Vocab
29
Physics
01/13/2008

Term
 uniform circular motion
Definition
 movement of object or particle trajectory at constant speed around circle with fixed radius
Term
 centripetal acceleration
Definition
 center-seeking acceleration of object moving in circle at constant speed
Term
 centripetal force
Definition
 net force exerted toward center of circle giving object centripetal acceleration
Term
 Kepler's 1st law
Definition
 planets move in elliptical paths with sun at one focus
Term
 Kepler's 2nd law
Definition
 imaginary line from sun to planet sweeps out equal areas in equal time intervals
Term
 Kepler's 3rd law
Definition
 square of the ratio of the periods of 2 planets equals the cube of the ratio of their average distance from the sun
Term
 gravitational force
Definition
 attractive force between 2 objects that is directly proportional to the mass of the objects
Term
 law of universal gravitation
Definition
 gravitational force between 2 objects is directly proportional the the product of their masses and inversely proportional the square of the distance between their centers
Term
 gravitational field
Definition
 surrounds object with mass; equals universal gravitational constant times the mass of the object, divided by the square of the distance from the object's center
Term
 inertial mass
Definition
 measure of object's resistance to force
Term
 gravitational mass
Definition
 size of gravitational force between 2 objects
Term
Definition
 1/2pi of a revolution
Term
 angular displacement
Definition
 change in angles as object rotates
Term
 angular velocity
Definition
 angular displacement of object divided by the time needed to make the displacement
Term
 angular acceleration
Definition
 change in angular velocity divided by the time needed to make the change; measured in rad/sec. squared
Term
 lever arm
Definition
 perpendicular distance from axis of rotation to point where force is exerted
Term
 torque
Definition
 measure of how effectively force causes rotation; equals force times the lever arm
Term
 moment of inertia
Definition
 resistance to rotation
Term
 Newton's 2nd law for rotational motion
Definition
 angular acceleration directly proportional to net torque and inversely prop. to moment of inertia
Term
 center of mass
Definition
 point on object that moves the same way that a point particle would move
Term
 centrifugal "force"
Definition
 apparent force that seems to pull on moving object but does not exert physical outward push on it and is observed only in rotating frames of reference
Term
 Coriolis "force"
Definition
 apparent force that seems to deflect a moving object from its path and is observed only in rotating frames of reference
Term
 periodic motion
Definition
 motion repeating in regular cycle
Term
 simple harmonic motion
Definition
 motion occurring when restoring force on object is directly proportion to the object's displace from equilibrium
Term
 period
Definition
 time required for object to repeat 1 complete cycle of motion
Term
 amplitude
Definition
 in periodic motion, the max. distance object moves from equilibrium
Term
 Hooke's law
Definition
 force on spring directly proportional to amount spring stretched
Term
 pendulum
Definition
 device demonstrating simple harmonic motion when its bob, suspended by a string of light rod, is pulled to 1 side and released, causing it to swing back and forth
Term
 resonance
Definition
 form of simple harmonic motion occurring when small forces applied at regular intervals to oscillating or vibrating object and the amplitude of the vibration increases
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