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GCSE Physics · key term
An interaction that occurs only while the objects are touching.
Used by OCR
Specification P2.2a · Paper 1 (Foundation), Paper 3 (Higher)
Revise: InteractionsA useful first step is to sort interactions into two groups: contact interactions, for which the objects must touch, and non-contact interactions, which can act across a separation.
Classify an interaction by asking whether the objects must touch: gravity, electrostatics and magnetism are non-contact interactions; normal contact force and friction require contact.
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