Physics 9702/33 — October/November 2010

Cambridge AS Level · Advanced Practical Skills · worked solutions for every part, with the mark scheme

questions

marks

120

minutes

Topics Manipulation, Measurement and Observation · Presentation of Data and Observations · Analysis, Conclusions and Evaluation

Q1Manipulation, Measurement and ObservationPresentation of Data and ObservationsAnalysis, Conclusions and EvaluationFree sample

In this experiment, you will investigate how the motion of a pendulum bob is affected by the height of the bob above the bench.

(a)

(i)

Set up the apparatus as shown in Fig. 1.1.

Fig. 1.1

The distance $h$ from the point of suspension to the bench should be as large as possible.

The distance $x$ between the centre of the bob and the bench should be approximately $5\text{ cm}$ .

(ii)

Measure and record distance $h$ .

Throughout this experiment, do not change the distance $h$ .

$h$ = ______

(iii)

Measure and record distance $x$ .

$x$ = ______

(b)

Displace the bob a small distance to the left. Release the bob and watch the movement.

The time the bob takes for each complete swing, first to the right and then back to the left, as shown in Fig. 1.2, is $T$ .

Fig. 1.2

By timing several of these complete swings, determine an accurate value of $T$ .

$T$ = ______

(c)

Keeping $h$ constant, change $x$ and repeat (a)(iii) and (b) until you have six sets of values for $x$ and $T$ . Include values for $T^2$ in your table of results.

(d)

(i)

Plot a graph of $T^2$ on the y-axis against $x$ on the x-axis.

(ii)

Draw the straight line of best fit.

(iii)

Determine the gradient and y-intercept of this line of best fit.

gradient = ______

y-intercept = ______

(e)

The quantities $T$ and $x$ are related by the equation

T^2 = A - Bx

where $A$ and $B$ are constants.

Use your answers to (d)(iii) to determine the value of $\frac{A}{B}$ .

Give an appropriate unit.

$\frac{A}{B}$ = ______

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Q2Manipulation, Measurement and Observation · Analysis, Conclusions and Evaluation · Presentation of Data and Observations

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