Physics 5054/41 — October/November 2010

Cambridge O-Level · Alternative to Practical · worked solutions for every part, with the mark scheme

questions

marks

minutes

Topics Experimental Contexts · Analysis, Conclusions and Evaluation · Use of Techniques, Apparatus and Materials · Observations and Measurements

Q1Use of Techniques, Apparatus and MaterialsExperimental ContextsObservations and MeasurementsAnalysis, Conclusions and EvaluationFree sample

A student performs an experiment to measure an elastic property of wood.

(a)

A metre rule is clamped with its $10.0\text{ cm}$ mark at the edge of a bench, as shown in Fig. 1.1.

Fig. 1.1

(i)

On Fig. 1.1, draw a second rule positioned to measure the height $h_0$ above the floor of the free end of the clamped metre rule.

(ii)

On Fig. 1.1, draw the position of the eye of the student when measuring $h_0$ .

(b)

A mass $m$ is hung from the $95.0\text{ cm}$ mark on the clamped metre rule, as shown in Fig. 1.2.

Fig. 1.2

The end of the rule moves down a distance $d$ , where $d = h_0 - h$ .

The student takes readings of $h$ for different values of $m$ .
Values of $m$ and $h$ are recorded in the table of Fig. 1.3.

Fig. 1.3

$m\text{ / g}$	$h\text{ / cm}$	$d\text{ / cm}$
20.0	75.0
40.0	74.2
60.0	73.4
80.0	72.7
100.0	72.0
120.0	71.2

(i)

Complete Fig. 1.3 to show the values of $d$ .

(ii)

On Fig. 1.4, plot the graph of $d\text{ / cm}$ on the y-axis against $m\text{ / g}$ on the x-axis.
Start your graph from the origin and draw the straight line of best fit.

Fig. 1.4

(iii)

Explain how the graph shows that $d$ is not directly proportional to $m$ .

(c)

(i)

Find the gradient of your graph. Show your working clearly.

gradient = ______

(ii)

Use information from (b) to find the length $L$ along the clamped metre rule from the edge of the bench to the point where the hanging mass is attached.

$L$ = ______

(iii)

The elastic property $E$ of the wood is given by the relationship

E = \frac{0.72 \times L^3}{\text{gradient}}

Calculate the value of $E$ .
You do not need to give the unit of your answer.

$E$ = ______

The rest of this paper

3 more questions

Q2Analysis, Conclusions and Evaluation · Experimental Contexts9M
Q3Experimental Contexts · Analysis, Conclusions and Evaluation6M
Q4Experimental Contexts3M

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