Year 7 - Science
The different kinds of force
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 identify and describe different kinds of force and their effects.
Key Notes
- Contact forces only act when objects are touching.
- Non-contact forces can act with or without the objects touching.
- Friction is a contact force that slows or prevents movement.
- Drag is a contact force that pushes against objects moving through liquids or gases.
Vocabulary To Learn
- contact force: Contact forces only act when objects are touching.
- friction: Friction is the force of one surface gripping or rubbing on another.
- drag: Objects moving through liquids and gases experience drag, a force that acts against the object's motion.
- non-contact force: Non-contact forces can act with or without objects touching.
Common Mistakes To Avoid
- An object 'has' force that provides it some kind of agency, which is independent of other objects.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Contact forces only act when objects are touching. Non-contact forces can act with or without the objects touching.
2. Define this scientific word and use it in context. 'contact force'
Contact forces only act when objects are touching. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: An object 'has' force that provides it some kind of agency, which is independent of other objects. Correction: Describe forces as interactions between two objects using the structure 'the force of object A on object B'.
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