2.  Distance is the amount of space between two objects. The most common unit of distance is the meter  △d = d 2 –d 1  The change in distance is equal to the difference between the beginning distance (usually zero) and the finished distance.

3.  Time – the duration between two events and usually is measure in seconds, minutes or hours  △t = t 2 -t 1  The change in time is equal to the difference between the beginning time ( usually zero) and the finishing time

4.  Speed- is a rate of motion  V= speed  V= △d/△t  Speed is the ratio between the change in distance and the change in time  V = (d 2 -d 1 )/(t 2 -t 1 )  Vav = △d/ △t  Average speed takes into consideration acceleration, constant speed and deceleration

5.  Distance and time are two terms that are linked when we look at how fast we travel  We might walk at 6km/hr, drive at 100km/hr or ride a mountain bike downhill at 45km/hr ◦ Ex Ian runs at 100m/10s or 10m/s