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Chapter Overview
Learning Goals
Learning Goals
Maths
Types of numbers
Number calculations
Fractions, decimals and percentages
Algebraic manipulation
Formulae and equations
Straight line graphs
Other graphs
Ratio
Proportion
Rates of change
Shapes
Properties of shapes
Lines and angles
Drawing shapes
Trigonometry
Probability
Maths
Summary
Speed is a measure of how much distance is travelled within a certain amount of time.
The formula to calculate speed is:
$speed=\frac{distance}{time}$
Or, more simply:
$S=\frac{D}{T}$
measurement | units |
Speed | metres per second ($m/s$), kilometres per hour ($km/h$), miles per hour $(mph)$ |
Distance | metres ($m$), kilometres ($km$), miles ($miles$) |
Time | seconds ($s$), hours ($h$) |
To solve problems involving speed, follow this procedure:
1. | Identify what values you have and what variable you want to find. |
2. | Rearrange the speed formula for the desired variable. |
3. | Substitute in known values. |
4. | Give the answer with the correct units. |
A car has travelled 250 kilometres in 5 hours. What was the speed of the car?
From the given information, identify the distance and the time:
$D=250km,\,T=5$ hours
Write the speed formula (no need to rearrange as it's already given in terms of speed):
$S=\frac{D}{T}$
Substitute in the known values:
$S=\frac{250km}{5h}$
Give the answer with the correct units:
$\underline{S=50km/h}$
Speed is a measure of how much distance is travelled within a certain amount of time.
The formula to calculate speed is:
$speed=\frac{distance}{time}$
Or, more simply:
$S=\frac{D}{T}$
measurement | units |
Speed | metres per second ($m/s$), kilometres per hour ($km/h$), miles per hour $(mph)$ |
Distance | metres ($m$), kilometres ($km$), miles ($miles$) |
Time | seconds ($s$), hours ($h$) |
To solve problems involving speed, follow this procedure:
1. | Identify what values you have and what variable you want to find. |
2. | Rearrange the speed formula for the desired variable. |
3. | Substitute in known values. |
4. | Give the answer with the correct units. |
A car has travelled 250 kilometres in 5 hours. What was the speed of the car?
From the given information, identify the distance and the time:
$D=250km,\,T=5$ hours
Write the speed formula (no need to rearrange as it's already given in terms of speed):
$S=\frac{D}{T}$
Substitute in the known values:
$S=\frac{250km}{5h}$
Give the answer with the correct units:
$\underline{S=50km/h}$
FAQs
Question: What is the formula for speed?
Answer: Speed = distance/time.
Question: What is speed?
Answer: Speed is a measure of how fast something is going.
Theory
Exercises
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