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Edexcel | Physics WPH0 | W 12 6 1 | 1 hour 30 minutes
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  • Q1
  • Q2
  • Q3
  • Q4
4
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A metre rule is clamped to the bench and a mass is attached to the end as shown. The

arrangement is called a cantilever.

When pulled down a short distance and released, the cantilever will oscillate. The

period of oscillation T will depend on the distance d of the mass from the clamped end,

providing the mass on the end is kept constant.

4
(a) (I)
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1 Mark

Add to the diagram to show how you would measure the distance d.

d drawn horizontally between edge of bench and centre of mass

4
(a) (II)
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2 Mark s

Describe how you would use a stopclock to determine an accurate value for T.

Max 2

• Use a timing marker in centre of oscillation

• Record the time of at least 10 oscillations at a time

• Means of ensuring accuracy of count eg tap in time with oscillation

or count from zero

• Repeat reading and take average

4
(b)
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The stopclock has a precision of 0.01 s.

4
(b) (I)
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1 Mark

State what is meant by this.

The smallest significant figure (scale division) is 0.01 s

Or measures to the nearest 0.01 s

Or records time to 2 dp

4
(b) (II)
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1 Mark

State why this is a suitable instrument for this measurement.

0.01 s « human reaction time (accept 0.1 s)

Or small percentage uncertainty

4
(c)
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4
(c) (I)
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1 Mark

Explain why a graph of lnT against lnd should be a straight line.

Correct expansion to ln T = q ln d + ln p

(compare with y = mx + c comparison need not be direct)

4
(c) (II)
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1 Mark

State how you would use your graph to obtain a value for q.

Gradient of line equals q 

4
(d)
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The following data were obtained in such an experiment.

4
(d) (I)
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4 Mark s

4
(d) (II)
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2 Mark s

Use your graph to find a value for q.

4
(d) (III)
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1 Mark

Comment on the validity of your value.

  • Q1
  • Q2
  • Q3
  • Q4

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