Physics 9702/31 — May/June 2014

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 a system in equilibrium due to several forces.

(a)

Measure and record the distance $L_0$ between the ends of the spring, as shown in Fig. 1.1.
Note that this distance includes the two loops at the ends.

Fig. 1.1

$L_0$ = ______ $\text{m}$

(b)

(i)

Set up the apparatus as shown in Fig. 1.2. Mass $m$ should be $0.200\ \text{kg}$ .
Do not change the height of the pulley or the clamp.

Fig. 1.2

(ii)

Adjust the apparatus until the angle $\theta$ is $90^{\circ}$ .

You may move the stands sideways or slide the knot along the string.

(iii)

Measure and record the distance $L$ between the ends of the spring loops.

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

(iv)

Calculate the extension $e$ of the spring using $e = L - L_0$ .

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

(c)

Vary $m$ and repeat (b)(ii), (b)(iii) and (b)(iv) until you have six sets of readings of $m$ and $L$ .

Include values of $m^2$ , $e$ and $e^2$ in your table.

10M

(d)

(i)

Plot a graph of $e^2$ on the $y$ -axis against $m^2$ 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 = ______

(e)

The quantities $e$ and $m$ are related by the equation

e^2 = -Pm^2 + Q

where $P$ and $Q$ are constants.

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

$P$ = ______
$Q$ = ______

(f)

The mass $M$ of X is given by

M = \sqrt{\frac{Q}{P}}

Use your answers in (e) to determine the value of $M$ .
Include a unit for $M$ .

$M$ = ______

The rest of this paper

1 more questions

Q2Manipulation, Measurement and Observation · Presentation of Data and Observations · Analysis, Conclusions and Evaluation20M

Loading the full paper…