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Frame of reference

is a system of objects that are not moving with respect to one another

Speed

is the ratio of the distance an object moves to the amount of time the object moves

Instantaneous speed

is computed for the entire duration of a trip, instantaneous speed is measured at a single moment., the speed of an object at one instant of time

Constant speed

speed that does not change

Average speed

a rate of motion determined by dividing the total distance traveled by the total travel time

Slope

the property possessed by a line or surface that departs from the horizontal

Velocity

distance travelled per unit time

Acceleration

The rate at which velocity changes

Deceleration

a decrease in speed

D-t graph

distance time graph

V-t graph

velocity time graph

Units for speed, acceleration, distance, velocity

m/s, m/s squared, m, mph, km/hr, m/s