Physics 9702/34 — May/June 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 the length of a loaded spring as the load is varied.

(a)

Measure and record the length $L$ of the metal rod.

$L$ = ______ $\text{m}$

(b)

(i)

Support the rod as shown in Fig. 1.1.

Fig. 1.1

(ii)

Adjust the position of the pivot so that it is approximately $5\ \text{cm}$ from the free end of the rod.

(iii)

Adjust the clamp so that the rod is horizontal and the spring is vertical.

(c)

Measure and record the length $h$ of the coiled part of the spring and the distance $d$ from the pivot to the point where the spring is attached to the rod.

$h$ = ______ $\text{m}$
$d$ = ______ $\text{m}$

(d)

Repeat (b)(iii) and (c) for different positions of the pivot along the rod until you have six sets of readings of $d$ and $h$ . Include values of $1/d$ in your table of results.

(e)

(i)

Plot a graph of $h$ on the $y$ -axis against $\frac{1}{d}$ on the $x$ -axis.

(ii)

Draw the line of best fit.

(iii)

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

gradient = ______
$y$ -intercept = ______

(f)

It is suggested that the relationship between $d$ and $h$ is

h = \frac{A}{d} + B

where $A$ and $B$ are constants.

The value of $A$ is equal to $\frac{Wz}{k}$

where $W$ is the weight of the rod,
$k$ is the spring constant of the spring
and $z$ is a constant.

The values for $W$ and $k$ are given on the card.

Use your answer from (e)(iii) and the values on the card to calculate $z$ . Give the appropriate unit.

$z$ = ______

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