Year 7 - Science
Reducing friction: practical
Forces
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit focuses on quantifying and comparing energy transfers in different processes, such as motion changes, electrical circuits, and fuel burning. It examines forces as interactions between objects, using diagrams and measurements, including contact and non-contact forces.
Lesson Summary
You will learn to collect data to test the effectiveness of different lubricants, taking steps to ensure a fair test.
Key Notes
- 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.
Vocabulary To Learn
- 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.
Common Mistakes To Avoid
- Friction is only between solids that are rubbing together.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key 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.
2. Define this scientific word and use it in context. 'lubricant'
Lubricants are substances added between two surfaces to reduce the friction between them. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Friction is only between solids that are rubbing together. Correction: Highlight the different amounts of friction between the solids that are separated by different liquids.
More Lessons In This Unit
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