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Edexcel A-Level Physics Newton’s Third Law and Force Pairs

Practise Edexcel A-Level Physics Newton’s third law and force pairs through interaction pairs, same-type forces, different bodies and reaction-force explanations.

Syllabus
Pearson Edexcel International Advanced Subsidiary/Advanced Level
Course
Physics XPH11/YPH11
Level
AS

Exam points

  • identify third-law pairs by equal magnitude, opposite direction, same type and different bodies
  • explain why weight and normal contact or magnetic forces do not form a third-law pair
  • apply action-reaction reasoning to jumps, pumps, rockets, helicopters or collisions

1.3.12 - Newton’s third law and force pairs question 1

[Maximum number: 2]

A steel object is held by an electromagnet. The magnetic force prevents the steel object falling.

State two reasons why the weight of the object and the force from the electromagnet are not a Newton third law pair.
(2)

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