In this experiment, you will investigate the equilibrium of a wooden rod supported by a spring. (i) Before assembling the apparatus, measure and record the length $C_o$ of the coiled section of the spring, as shown in Fig. 1.1. $C_o$ = \_\_\_\_\_\_ $\text{cm}$ (ii) Assemble the apparatus as shown in Fig. 1.2 with each nail held securely in a boss. Adjust the bosses until the upper nail is approximately $35\text{ cm}$ above the bench and the lower nail is approximately…

Physics 9702/33 — February/March 2021

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 equilibrium of a wooden rod supported by a spring.

(a)

(i)

Before assembling the apparatus, measure and record the length $C_o$ of the coiled section of the spring, as shown in Fig. 1.1.

Fig. 1.1

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

(ii)

Assemble the apparatus as shown in Fig. 1.2 with each nail held securely in a boss.

Fig. 1.2

Adjust the bosses until the upper nail is approximately $35\text{ cm}$ above the bench and the lower nail is approximately $10\text{ cm}$ above the bench.
Position the string loop in one of the grooves near the middle of the rod.
Adjust the free end of the string so that the rod is parallel to the bench and then secure it in the split cork.
Measure and record the length $C$ of the coiled section of the spring, as shown in Fig. 1.2.

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

Calculate $E$ , where $E = C - C_o$ .

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

(iii)

The distance from the centre of the lower nail to the groove with the string loop in it is $x$ . Measure and record $x$ .

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

(b)

Move the string loop into another groove and adjust the apparatus so that the rod is parallel to the bench.
Measure $C$ and $x$ .

Repeat until you have at least six sets of values of $C$ and $x$ .
Record your results in a table. Include values of $E$ and $\frac{1}{E^4}$ in your table.

(c)

(i)

Plot a graph of $\frac{1}{E^4}$ 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 = ______

(d)

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

\frac{1}{E^4} = ax + b

where $a$ and $b$ are constants.

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

$a$ = ______
$b$ = ______

The rest of this paper

1 more questions

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

Loading the full paper…