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Average Speed and Instantaneous Speed

Motion at Constant Speed in a Straight Line

speed =

distance
time

Average Speed

Average speed

total distance
total time

Instantaneous Speed

Instantaneous v =

Δs
Δt

where Δt is a short time interval and Δs is the change in displacement.
Circular Paths

velocity

= speed in a particular direction

change in velocity =

change in speed

change in direction

An object moving in a circular path at constant speed changes its velocity constantly as its direction changes constantly.

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Specification: AQA Physics (7407), AS-level, 3.4.1.3 Motion along a straight line. Topic: Motion.