Mrs. Nunn: Motion

Created by mrslnunn 

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25 terms

motion

continuous change in the position of an object (as judged by a reference point)

reference point

object or location used to judge or measure motion; considered to be stationary

speed

rate at which distance changes

average speed

overall speed for a period of time; calculated as distance divided by time

instantaneous speed

speed at a particular instant (moment in time)

constant speed

speed that does not change

velocity

speed + direction (for straight line motion)

average velocity

overall velocity for a period of time; includes average speed + direction (for straight line motion)

instantaneous velocity

velocity at a particular instant (moment in time)

constant velocity

occurs when speed and direction do not change

acceleration

1. rate at which speed or velocity changes 2. occurs whenever velocity (speed or direction) changes

positive acceleration

occurs when a forward moving object speeds up

negative acceleration

occurs when a forward moving object slows down

speedometer

device that indicates the instantaneous speed of a vehicle

deceleration

another word for negative acceleration

uniform motion

occurs when there is no change in speed or direction (no acceleration)

slope

the steepness of a line graph (in math, the rise over the run)

distance

how far an object travels; the length of the path of motion

time

the duration of an event; how long something lasts

direction

answers the question, "which way?"; must be provided when describing velocity

distance/time graphs

used to show the speed of a moving object; always set up with distance on the y-axis and time on the x-axis; slope = speed

speed/time graphs

used to show the acceleration of a moving object; always set up with speed on the y-axis and time on the x-axis; slope = acceleration

per

symbol is /; means division

overall speed

same as average speed

odometer

device that indicates distance traveled by a vehicle (such as a car or bike)

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