# Measuring the speed of water waves from distance and time

I can explain how to make measurements of distance and time to accurately measure the speed of water waves.

# Measuring the speed of water waves from distance and time

I can explain how to make measurements of distance and time to accurately measure the speed of water waves.

## Slide deck

## Lesson details

### Key learning points

- The speed of water waves can be measured using measurements of distance travelled and time taken.
- Random errors are made when the method limits how accurate a measurement can be.
- The effect of random errors can be reduced by repeating readings and calculating a mean.
- The uncertainty in a mean result is calculated from half the range of the repeat measurements.

### Common misconception

Calculating a mean of repeat readings reduces (random) errors in measurements.

Calculating a mean reduces the effect that random errors have on a final result. The random errors in the original readings are unaffected.

### Keywords

Random error - A random error is caused by unpredictable factors that affect the measurement of a variable.

Uncertainty - Uncertainty is an estimate of how far from the true value a measurement might be. It is equal to half the range of repeat measurements.

Mean - The mean is calculated by adding each measurement and dividing by the number of measurements.

Anomalous result - An anomalous result is a measurement that is a mistake. A line should be drawn through it and it should not be used to calculate a mean.

### Content guidance

- Equipment requiring safe usage.

### Supervision

Adult supervision recommended.

### Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

## Video

Loading...

## Worksheet

## Starter quiz

### 6 Questions

metres (m)

seconds (s)

metres per second (m/s)