Physics 9702/34 — May/June 2013

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

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

In this experiment, you will investigate how a force acting on a pivoted wooden strip changes as the pivot position is moved.

(a)

(i)

Assemble the apparatus as shown in Fig. 1.1 with the nail through the central hole in the wooden strip.

Fig. 1.1

(ii)

Adjust the nail height so that the wooden strip is parallel to the bench.
Adjust the position of the stand or the large mass so that the newton-meter is vertical.

(b)

(i)

Measure and record the distance $d$ from the nail to the string loop attached to the newton-meter, as shown in Fig. 1.1.

$d$ = ______

(ii)

Record the force $F$ indicated by the newton-meter.

$F$ = ______ $\text{N}$

(c)

Reposition the strip with the nail through different holes and repeat (a)(ii) and (b) until you have six sets of values of $d$ and $F$ .
Include values of $\frac{1}{d}$ in your table.

Do not use holes that result in a force outside the range of the newton-meter.

11M

(d)

(i)

Plot a graph of $F$ on the $y$ -axis against $\frac{1}{d}$ 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 $F$ and $d$ are related by the equation

F = \frac{a}{d} + b

where $a$ and $b$ are constants.

Using your answers from (d)(iii), 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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