Velocity
Velocity measures how much the displacement changes, every second.
It measures the rate of change of displacement in a specific direction, so it is a vector quantity.
Example
Section titled “Example”-
We walk 25km north in 5 hours, so to find our velocity:
-
displacement =
north -
velocity = displacement / time
-
-
Or, if we walk
north then 500m south in , finding our velocity: -
displacement =
south -
-
south
Where:
is the displacement, measured in metres, is the velocity, measured in metres per second, ( ) is the time, measured in seconds,
A van drives 200m in 10s. Calculate the velocity.
Section titled “A van drives 200m in 10s. Calculate the velocity.”- Answer:
A car drives 75m in 5s. Calculate the velocity.
Section titled “A car drives 75m in 5s. Calculate the velocity.”- Answer:
A car drives south 50m then north 150m, in 20s. Calculate the average velocity.
Section titled “A car drives south 50m then north 150m, in 20s. Calculate the average velocity.”- displacement =
north - Answer:
north
A bike drives 10m in 20s. Calculate the velocity.
Section titled “A bike drives 10m in 20s. Calculate the velocity.”- Answer:
A truck drives 240m in 8s. Calculate the velocity.
Section titled “A truck drives 240m in 8s. Calculate the velocity.”- Answer:
A car drives 300m in 12s. Calculate the velocity.
Section titled “A car drives 300m in 12s. Calculate the velocity.”- Answer:
A van drives 600m in 15s. Calculate the velocity.
Section titled “A van drives 600m in 15s. Calculate the velocity.”- Answer:
A person cycles for 4h until reaching a destination 100km away. Calculate their average velocity.
Section titled “A person cycles for 4h until reaching a destination 100km away. Calculate their average velocity.”- Answer:
A person cycles 100km north in 4h. Calculate their average velocity.
Section titled “A person cycles 100km north in 4h. Calculate their average velocity.”- Answer:
north