Physics 9702/31 — May/June 2016

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 the motion of a loaded wooden strip.

(a)

(i)

Use the modelling clay to attach the slotted masses to the centre of the wooden strip as shown in Fig. 1.1 and Fig. 1.2.

Fig. 1.1

Fig. 1.2

(ii)

Measure and record the distance $x$ between the end of the wooden strip with the small string loop attached and the centre of the slotted masses as shown in Fig. 1.1.

$x$ = ______

(b)

(i)

Set up the apparatus as shown in Fig. 1.3.

Fig. 1.3

(ii)

Slide the small string loop over the rod of a stand and fix it in place using a clip.

Slide the free loop of the spring down the rod of the other stand and fix it in place using the other clip.

(iii)

Adjust the apparatus until the large string loop and springs are parallel to the bench.

(iv)

Use G-clamps to secure both stands to the bench.

(c)

Move the right-hand end of the wooden strip downwards through a distance of approximately $3\ \text{cm}$ . Release the wooden strip.

The wooden strip will oscillate.

Determine the period $T$ of these oscillations.

$T$ = ______

(d)

Change $x$ by moving the slotted masses along the wooden strip.

For each value of $x$ , adjust the position of the clips so that the large string loop and springs are parallel to the bench.

Repeat (a)(ii) and (c) until you have five sets of values of $x$ and $T$ .

Include values of $T^2$ in your table.

10M

(e)

(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.

gradient = ______
$y$ -intercept = ______

(f)

It is suggested that the quantities $T$ and $x$ are related by the equation

T^2 = Px + Q

where $P$ and $Q$ are constants.

Using your answers in (e)(iii), determine the values of $P$ and $Q$ . Give appropriate units.

$P$ = ______
$Q$ = ______

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Q2Manipulation, Measurement and Observation · Analysis, Conclusions and Evaluation · Presentation of Data and Observations20M

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