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# College Physics Ch.1

### College Physics A strategic Approach 2nd Ed ch 1 terms

define MOTION The change of an object's position or orientation with time
define TRAJECTORY the path along which an object moves, which might be a straight line or might be curved
define MOTION DIAGRAM a composit image showing an object's position at several equally spaced instants of time
define PARTICLE an object that can be represented as a mass at a single point in space
define MODEL a simplificaation of reality
define PARTICLE MODEL a simplification in which we treat a moving object as if all of is mass were concentrated at a single point
define ONE-DIMENSIONAL (1-D) an object that can only move along a straight line.
define POSITION location of an object at a particular instance in time
define ORIGIN a fixed reference point from which all distances are to be measured
define COORDINATE SYSTEM an origin, and an axis marked in both the positive and negative directions
define COORDINATE the symbol that represents a position along an axis
define DISPLACEMENT a change of position
define TIME INTERVALS changes in time
define UNIFORM MOTION objects moving along a straight line at a constant speed
define VELOCITY the displacement of an object in a given time interval v=Δx/Δt
define SIGNIFICANT FIGURES a digit that is reliably known
SI units for time second (s)
SI units for length meter (m)
SI units for mass kilogram (kg)
Common prefixes M mega power of 10 6
Common prefixes k kilo power of 10 3
Common prefixes c centi power of 10 -2
Common prefixes m mili power of 10 -3
Common prefixes μ micro power of 10 -6
Common prefixes n nano power of 10 -9
1 in = ?cm 2.54 cm
1 ft = ?m 0.305 m
1 mi = ? km 1.609 km
1 mph = ? m/s 0.447 m/s
1 m = ?in 39.37 in
1 km = ? mi 0.621 mi
1 m/s = ?mph 2.24 mph
define CONVERSION FACTOR a ratio of values equal to 1
define ORDER OF MAGNITUDE ESTIMATE a one-signficant-figure estimate or calculation such as estimate of speed indicated by ~
define SCALAR QUANTITY a physical quantity is described by a single number with a unit - can be positive negative or zero
define VECTOR QUANTITY a quantity that has both a size (how far? how fast?) and a direction (which way?) Graphically represent a vector as an arrow over symbols
define MAGNITUDE the size or length of a vector
define DISPLACEMENT VECTOR displacement quantity having both magnitude and direction and can be represnted by a vector
define VELOCITY VECTOR points the direction of the objects motion and whole magnitude is the object's speed
Created by: missMRWhite