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Phisics Test: Motion
test on distance and displacement, speed and velocity, and acceleration
27
Science
04/14/2008

Term
 What is necessary to describe motion?
Definition
 a frame of reference
Term
 frame of reference
Definition
 system of objects that are not moving with respect to one another
Term
 relative motion
Definition
 movement in relation to a frame of reference
Term
 distance
Definition
 length of path betweentwo points
Term
 Measuring displacement (KEY!!)
Definition
 displacement is the direction from the starting point and the length of a straight line from the starting point to the ending point
Term
 vector
Definition
 quantity that has magnitude and direction
Term
Definition
Term
 resultant vector
Definition
 vector sum of 2 or more vectors
Term
 speed
Definition
 ratio of the distance an object moves to the amountof time the object moves
Term
 average speed and instantaneous speed (KEY!!)
Definition
 average speed is computed for the entire duration of a trip and instantaneous speed is measured at a particular instant
Term
 formula for speed or average speed
Definition
 average speed= total distance/ total timeorv= d/t
Term
 instantaneous speed
Definition
 is the rate at which an object is moving at a given moment in time
Term
 graphing motion
Definition
 the slope of a line on a distance-time graph is speed
Term
 velocity
Definition
 the speed and direction in which an object is moving
Term
 velocity is a description of......
Definition
 both speed and direction of motion. velocity is a vector
Term
 combining velocities
Definition
Term
 acceleration
Definition
 the rate at which velocity changes
Term
 acceleration can be described as.....
Definition
 changes in speed, changes in direction, or changes in both. Acceleration isa vector
Term
 free fall
Definition
 the movement of an object towards earth solely because of gravity
Term
 constant acceleration
Definition
Term
 formula for acceleration
Definition
 acceleration= changes in velocity/ total timeora= Vf- Vi/ t
Term
 graphs of accelerated motion
Definition
 slope of a speed-time graph is acceleration
Term
 linear graph
Definition
 the displayed data on the graph form straight-line parts
Term
 distance-time graphs (nonlinear graph)
Definition
 a curve connects the data points that are plotted
Term
 instantaneous acceleration
Definition
 how fast a velocity is changing at a specific instant
Term
 motion is described with respect to a
Definition
 frame of reference
Term
 displacement is distance combined with
Definition
 direction
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