Physics 9702/34 — October/November 2020

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

Q120MManipulation, Measurement and ObservationPresentation of Data and ObservationsAnalysis, Conclusions and EvaluationFree sample

You may not need to use all of the materials provided.

In this experiment, you will investigate the equilibrium of a metre rule with a chain attached.

(a)

● Attach the boss to the stand at a height of approximately $60\text{ cm}$ above the bench.
● Assemble the apparatus as shown in Fig. 1.1 with the nail held securely in the boss.
● Attach one end of the chain of paper clips to the string loop and allow the other end of the chain to rest on the bench.
● Attach the piece of adhesive putty to the metre rule approximately $40\text{ cm}$ from the nail.

Fig. 1.1

● Measure and record the distance $x$ between the nail and the centre of the piece of adhesive putty, as shown in Fig. 1.1.

$x$ = ______ $\text{cm}$

(b)

Measure and record the angle $\theta$ between the metre rule and the plumb line, as shown in Fig. 1.1.

$\theta$ = ______ $^{\circ}$

(c)

Vary $x$ and measure $\theta$ until you have six sets of values of $x$ and $\theta$ .
Do not use values of $x$ less than $15\text{ cm}$ .

Record your results in a table. Include values of $\cos \theta$ in your table.

10M

(d)

(i)

Plot a graph of $\cos \theta$ 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 = ______

(e)

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

\cos \theta = ax + b

where $a$ and $b$ are constants.

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

$a$ = ______
$b$ = ______

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

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