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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

Understanding moments in physics is essential for analyzing rotational systems.

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Moment of a Force

The moment of a force is calculated as the product of the force and the distance from the pivot point. For example, if a force of 10 N is applied 0.5 m from the pivot, the moment is calculated as follows:

  1. a

    State the formula for calculating the moment of a force.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: Turning effect of forces

Paper 3Theory (Core)3 marks

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Practical Application of Moments

Consider a seesaw with two children sitting at different distances from the pivot. Child A weighs 30 kg and sits 1 m from the pivot, while Child B weighs 20 kg and sits 1.5 m from the pivot. Calculate the moments for both children and determine which side will go up.

  1. a

    Explain which child will cause the seesaw to tilt and why.

    Aim for approximately 3 distinct marking points.

    [3]