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Cambridge IGCSE Physics practice

Paper 6 structured question: Turning effect of forces

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6

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1

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Topic

Turning effect of forces

Exam-style question

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Paper 6Alternative to PracticalPractical1 marks

Investigating moments in a balanced beam experiment.

Method

Balanced Beam Experiment

In this experiment, a beam is balanced on a fulcrum with weights placed at various distances from the fulcrum. The aim is to show that when the moments on either side are equal, the beam remains horizontal.

Weight (N)Distance from Fulcrum (m)Moment (Nm)
20.51
30.331
40.251
  1. a

    State the independent variable in this experiment.

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 6 structured question: Turning effect of forces

Paper 6Alternative to PracticalPractical2 marks

Results Table

Results of Moments Experiment

The table shows the moments calculated for different weights and distances from the fulcrum.

Weight (N)Distance (m)Moment (Nm)
20.51
30.331
40.251
  1. a

    Explain why the beam remains in equilibrium when the moments are equal.

    Aim for approximately 2 distinct marking points.

    [2]