Physics 5054 · O Level · Balanced and unbalanced forces

Balanced and unbalanced forces — practice question

Four of the gravitational forces acting between bodies in the Solar System are shown below. $P$ the force on the Moon due to the Earth $Q$ the force on the Earth due to the Sun $R$ the force on the Earth due to the Moon $S$ the force on the Moon due to 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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