SPEED, VELOCITY AND ACCELERATION
the metric system or SI (Système International) is used in Canada.
Base Units are the units from which the other units are derived.
Length: metre (m)
Time: second (s)
Mass: kilogram (kg)
Derived units are the units derived from the base units. Examples: m/s, m/s2
A scalar quantity is one that has magnitude only. E.g.: Speed, distance, time.
Distance: Length of the path travelled and has no direction. E.g.: Δd = 16 m
Time: Time taken. E.g.: Δt = 8 s
Speed: Change in distance divided by the elapsed time. E.g.: v = 2 m/s
A vector quantity is one that has both magnitude and direction. Vector quantities are velocity, position, displacement.
Position: Distance and direction of an object from a reference point. E.g.: d = 8 m [N]
Displacement: Change in position of an object in a given direction. : 14 m [S]
Velocity: E.g.: v = 7m/s [S]
Acceleration is the change in velocity per unit time.
vf : Final velocity. E.g.: 10 m/s2 [E]
vi : Initial velocity. E.g.: 4 m/s2 [E]
Δv: Change in velocity. v = 6m/s [E]
Δt: Time interval. t = 2 s
Acceleration. E.g.: 3 m/s2 [E]