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GCSE Physics · key term
A pair of equal-sized, opposite-direction forces of the same type that two interacting objects exert on one another.
Used by Edexcel and OCR
Specification 9.1 · Paper 2
Revise: Object InteractionsThe two arrows for an interaction pair therefore point in opposite directions and have equal lengths, but each belongs to a different object. They do not cancel each other out on one object.
Specification P2.2p · Paper 1 (Foundation), Paper 3 (Higher)
The two equal and opposite forces produced by one interaction, with one force acting on each of the two interacting objects.
Paper 1, Paper 2
The two forces produced when two objects interact; they are the same type, equal in magnitude, opposite in direction and act on different objects.
Revise: ForcesDuring the interaction, each object exerts a force on the other. These two forces form an interaction pair.
An interaction pair acts on two different objects. The book’s weight and the table’s upward force both act on the book, so they are not an interaction pair.
Name both objects when identifying an interaction pair: write “force on A from B” and “force on B from A”.
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