# Shared Flashcard Set

## Details

physics
physics
25
Physics
10/03/2012

Term
 physics
Definition
 the branch of science with the ulimited laws tha the governs the structure and th eforms of matter and engery
Term
 mechanics
Definition
 The branch of physiscs that deals with the motion of objects and the forces that change it
Term
 Kinematics
Definition
 A branch of mechanics which describes the motion of an object without ecplicit reference to the forces that act upon an object.
Term
 Physical quantity
Definition
 A quantity that can be used to describe a physical process or/and physical phenomenon.
Term
 Scalar physical quantity
Definition
 Can be described by a magnitutde ( number and unit )
Term
 Vector physical quantity
Definition
 can be described by a magnituide and a direction
Term
 Rectangular components of a vector
Definition
 Two perpendicular vectors whose vector sum is equal to the original vector.
Term
 International system of Units
Definition
 base units are a meter= length,kilogram = mass, second = time, mole = amount ofmatter, kelvin = temp.ampere = electric currentcandela = luminous intensity.
Term
 Frame of reference
Definition
 an object with a coordinate system that can be used to define and describe motion.
Term
 Mechanical motion
Definition
 change in position of an object with respect to the frame of reference.
Term
 Displacement
Definition
 a vector representing the change in position of an object, drawn from the intial to the final position of an object.
Term
 Distance
Definition
 the length of a path along an object
Term
 Time interval
Definition
 difference in time between two clock readings
Term
 Velocity
Definition
 the rate of motion in a given direction of the rate of displacement
Term
 Speed
Definition
 the rate of motion / rate of distance
Term
 Instantaneous velocity
Definition
 the rate of a displacement at a particular moment of time and a particular point of a path of motion.
Term
 Average velocity
Definition
 a vector physical quantity that is equal the ration of a displacement over a timeinterval.
Term
 average speed
Definition
 a scalar physical quantuty that is equal to the ration of a distance over a time interval.
Term
 Acceleration
Definition
 is the rate of velocity
Term
 Path
Definition
 is the line along which an object participates in motion.
Term
 trajectory
Definition
 path followed by a projectile
Term
 Free falling motin
Definition
 an idealized motin in gravitational field when air resistance is neglected an acceleration due to gravity is nearly constatnt
Term
 Linear motion
Definition
 a motion of an object whose path of motion is a straight line.
Term
 Projectile motion
Definition
 two dimensional motion of an object in gravitational field when along one dimensiton there is a uniform linear motion and along the second dimension there is a uniformlu accelerated linear motion.
Term
 Range of a projectile
Definition
 a horizontal distance of a projectile
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