Reducing friction: practical
I can collect data to test the effectiveness of different lubricants, taking steps to ensure a fair test.
Reducing friction: practical
I can collect data to test the effectiveness of different lubricants, taking steps to ensure a fair test.
Lesson details
Key learning points
- Lubricants are substances added between two surfaces to reduce the friction between them.
- In a fair test, only the variable we are testing is changed.
- In a fair test, everything we are not testing is kept the same for every measurement.
- Repeat measurements help check for anomalous results.
- A mean combines repeat measurements into a single result.
Common misconception
Friction is only between solids that are rubbing together.
Highlight the different amounts of friction between the solids that are separated by different liquids.
Keywords
Lubricant - Lubricants are substances added between two surfaces to reduce the friction between them.
Fair test - In a fair test, only the variable being tested is changed, so any differences in results can only be due to that variable.
Anomalous result - Anomalous results are ones that do not fit the pattern we see for other measurements.
Repeat measurement - A repeat measurement is when you make a measurement again to check the result.
Mean - A mean combines repeat measurements into a single result.
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
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
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