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Cambridge IGCSE Physics practice

Paper 3 structured question: Turning effect of forces

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Turning effect of forces

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Paper 3Theory (Core)1 marks

A beam is supported at both ends and is in equilibrium.

Description

Equilibrium of a Beam

The beam has a weight of 200 N acting downwards at its center. Two supports apply upward forces of 100 N each at the ends of the beam.

  1. a

    State the condition for the beam to be in equilibrium.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Turning effect of forces

Paper 3Theory (Core)4 marks

Description

Seesaw Balance

Child A weighs 30 kg and sits 2 m from the pivot. Child B weighs 40 kg. Calculate the distance Child B must sit from the pivot to maintain equilibrium.

  1. a

    State the principle that allows the seesaw to be in equilibrium.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Describe how to calculate the distance Child B must sit from the pivot.

    Aim for approximately 3 distinct marking points.

    [3]