motion

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 and direction

average velocity

overall velocity for a period of time; includes average speed and direction

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

speeding up

negative acceleration

slowing 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); another term for constant velocity

odometer

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

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

Voice Recording