Year 7 - Science
Reducing friction: analysis
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 analyse data from an investigation to test the effectiveness of different lubricants.
Key Notes
- Categoric variables come in distinct types. Continous variables can take any value on a numerical scale.
- Bar charts are used when the variable you changed in an experiment is categoric.
- An effective lubricant reduces the friction force.
- A conclusion states what you found out in an experiment and also explains how you know.
Vocabulary To Learn
- lubricant: A lubricant is a substance added between two surfaces to reduce friction.
- friction: Friction is the force of one surface gripping or rubbing on another.
- categoric: A variable is categoric if it comes in distinct, separate categories.
- continuous: A variable is continuous if it can take any value, including decimals, on a scale of numbers.
- conclusion: A conclusion states what you found out in an experiment and explains how you know.
Common Mistakes To Avoid
- The type of graph chosen to represent data can just be personal choice.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Categoric variables come in distinct types. Continous variables can take any value on a numerical scale. Bar charts are used when the variable you changed in an experiment is categoric.
2. Define this scientific word and use it in context. 'lubricant'
A lubricant is a substance added between two surfaces to reduce friction. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: The type of graph chosen to represent data can just be personal choice. Correction: Specific kinds of graph should be chosen to represent specific kinds of data.
More Lessons In This Unit
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