Speed and Velocity
Calculation of Speed and Velocity
a) How to calculate Speed
Definition: The total distance traveled by an object in a set of time in a linear motion.
Speed = Distance/Time
Time = Distance/Speed
Distance = Speed * Time
For example:
The distance from home to school is 20 kilometers, it took James 40 minutes to come to school. What is his average speed/speed?
Formula: Speed = Distance/Time
= Speed = 20 km /40 m
= Speed = 0.5 km
= Speed = 0.5 km/m
= Speed = 1 km / 2 m
We can make it into a integer to make it easier.
b) How to calculate Velocity
Definition: How fast something is moving and the direction.
As you already know from the other page, Velocity always comes with direction and speed. Which is a vector quantity!
Velocity = Displacement/Time & Direction
For example:
The displacement from the tree to the rock is 50 meters North, it took James 10 seconds to run from the tree to the rock. What is the velocity?
Formula: Velocity = Displacement/Time & Direction
= Velocity = 50 m/ 10s North
= Velocity = 5 m/s North
c) Acceleration
Definition: The change of velocity when traveling.
Acceleration = Final Velocity - Initial Velocity/Time & Direction
or
Acceleration = Average Velocity/Time & Direction
For example:
James's car went from 30km/h to 60km/h in 3 seconds, he is traveling North. What is his acceleration?
Formula: Acceleration = Final Velocity - Initial Velocity/Time & Direction
= Acceleration = 60km - 30km/3s & North
= Acceleration = 30km/3s & North
= Acceleration = 10 North
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