Measuring speed accurately
I can clearly describe how to measure speed and explain how I can do this accurately.
Measuring speed accurately
I can clearly describe how to measure speed and explain how I can do this accurately.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- The instantaneous speed of an object is the speed at a particular moment in time.
- For an accurate measurement a person needs to be in line with the observation.
- Manual timing can lead to a range of timing errors.
- Repeat readings can reduce the effect of random errors.
- Some readings are anomalous and these should not be used in caluations of averages.
Keywords
Average speed - The average speed of an object is the distance it travels per unit of time, measured in metres per second (m/s). It is a scalar quantity.
Instantaneous speed - The instantaneous speed of an object is its speed at a particular moment.
Timing error - Manual timings include some timing errors. These can be due to reaction times or observing from incorrect positions.
Random error - Random errors are errors that vary from test to test in an uncontrolled way.
Common misconception
Pupils commonly confuse instantaneous and average speeds.
Be very careful when using the word speed, always use 'average' or 'instantaneous' explicitly, linking average speed to a time period.
To help you plan your year 8 science lesson on: Measuring speed accurately, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 8 science lesson on: Measuring speed accurately, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 3 science lessons from the Moving by force unit, dive into the full secondary science curriculum, or learn more about lesson planning.
Equipment
Licence
Starter quiz
6 Questions
distance
time
speed
Exit quiz
6 Questions
unpredictable difference between measurement and true value
a difference in a measurement of time and the true time
the speed at a particular moment
overall distance travelled divided by overall time taken