Physics 9702/34 — May/June 2015

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

questions

marks

120

minutes

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

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

In this experiment, you will investigate a metre rule rocking on a beaker.

(a)

Assemble the apparatus as shown in Fig. 1.1 with the beaker horizontal. The centres of each of the two masses should be at the same distance $r$ from the centre of the metre rule, where $r$ is approximately $30\text{ cm}$ .

Fig. 1.1

(b)

(i)

Measure and record the distance $r$ .

$r$ = ______

(ii)

Adjust the position of the metre rule on the beaker so that the metre rule is balanced and approximately parallel to the bench.

(c)

(i)

Hold down the end of the metre rule on A, as shown in Fig. 1.2.

Fig. 1.2

(ii)

Release the metre rule and measure and record the time $T$ for it to move up and then down again to its lowest position, as shown in Fig. 1.2.

$T$ = ______ $\text{s}$

(d)

Reposition the two masses at a different distance $r$ from the centre of the metre rule and repeat (b) and (c) until you have six sets of values of $r$ and $T$ .

Use values of $r$ less than or equal to $40\text{ cm}$ .
Include values of $r^2$ and $T^3$ in your table.

(e)

(i)

Plot a graph of $T^3$ on the $y$ -axis against $r^2$ on the $x$ -axis.

(ii)

Draw the straight line of best fit.

(iii)

Determine the gradient and $y$ -intercept of this line.

gradient = ______
$y$ -intercept = ______

(f)

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

T^3 = ar^2 + b

where $a$ and $b$ are constants.

Use your answers from (e)(iii) to determine the values of $a$ and $b$ .
Give appropriate units.

$a$ = ______
$b$ = ______

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