Measuring

1. Length and Distance

1.1. units

1.1.1. centimetre (cm)

1.1.2. metre (m)

1.1.3. kilometre (km)

1.2. tools

1.2.1. ruler

1.2.2. motion sensor

1.2.3. measuring tape

2. Time

2.1. units

2.1.1. seconds (s)

2.1.2. minute (m)

2.1.3. hour (h)

2.2. tools

2.2.1. mechanical stopwatch

2.2.2. digital stopwatch

3. Speed

3.1. how to calculate

3.1.1. average speed = distance travelled ÷ time taken