Physics 9702/34 — October/November 2019

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 the motion of a wooden strip balanced on a curved surface.

(a)

• Assemble the apparatus as shown in Fig. 1.1.
• Use pieces of modelling clay to ensure that the beaker is secure and that its axis is horizontal.
• The centre of each mass should be the same distance $x$ from the line at the midpoint of the wooden strip, where $x$ is approximately $15\text{ cm}$ .

Fig. 1.1

• Measure and record $x$ .

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

(b)

• Push one end of the strip down by approximately $2\text{ cm}$ and release it so that it oscillates.
• Take measurements to find the period $T$ of the oscillations.

$T$ = ______ $\text{s}$

(c)

Change $x$ and measure $T$ . Repeat until you have six sets of values of $x$ and $T$ .

Record your results in a table. Include values of $x^2$ and $T^2$ in your table.

(d)

(i)

Plot a graph of $T^2$ on the $y$ -axis against $x^2$ 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)

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

T^2 = ax^2 + b

where $a$ and $b$ are constants.

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

$a$ = ______

$b$ = ______

(f)

• Take measurements to find the radius $R$ of the beaker.

$R$ = ______

• An approximate value for the acceleration of free fall $g$ is given by

g = \frac{4\pi^2}{Ra}

Calculate $g$ .

$g$ = ______

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

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