Physics 5054 · O Level · Balanced and unbalanced forces

Balanced and unbalanced forces — practice question

Four gravitational forces acting between bodies in the Solar System are given below. $P$: the force on the Moon from the Earth $Q$: the force on the Earth from the Sun $R$: the force on the Earth from the Moon $S$: the force on the Moon from the Sun Which two forces form a Newton’s third law pair (action and reaction)?

  • AP and Q
  • BP and R
  • CQ and S
  • DR and S

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