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This lesson covers the two main categories of forces — contact forces and non-contact forces — as required by AQA GCSE Combined Science Trilogy (8464), section 6.5.1. You will learn how to classify forces, understand weight and its calculation, and interpret free body diagrams. Forces are central to nearly every physics question, so a solid grasp of this material is essential.
A force is an interaction between two objects that can:
Forces are measured in newtons (N) using a newton meter (spring balance). Force is a vector quantity — it has both magnitude and direction.
Key Fact: Forces always exist in pairs. When object A exerts a force on object B, object B always exerts a force back on object A. This is Newton's third law, covered in Lesson 8.
A contact force acts between two objects that are physically touching. The objects must be in direct contact.
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