Physics 9702/33 — October/November 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 the motion of a ball and rod.

(a)

Press the ball of modelling clay onto the end of the wooden rod, as shown in Fig. 1.1.

Fig. 1.1

(b)

(i)

Set up the apparatus as shown in Fig. 1.2 with the nail through the hook in the wooden rod.

Fig. 1.2

(ii)

Measure and record the distance $L$ between the nail and the centre of the ball.

$L$ = ______

(c)

Move the bottom of the rod to the left.

Release the rod and watch the movement.

The rod will move to the right and then to the left again, completing a swing as shown in Fig. 1.3.

Fig. 1.3

Measure and record the time for at least 10 swings.
Record enough readings to determine an accurate value for the time $T$ taken for one complete swing.

$T$ = ______

(d)

Decrease $L$ by moving the ball along the rod, and repeat (b)(ii) and (c) until you have six sets of values of $L$ and $T$ .

Include values of $T^2L$ and $L^2$ in your table.

10M

(e)

(i)

Plot a graph of $T^2L$ on the $y$ -axis against $L^2$ 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 = ______

(f)

The quantities $T$ and $L$ are related by the equation

T^2L = AL^2 + B

where $A$ and $B$ are constants.

Use your answers in (e)(iii) to determine the values of $A$ and $B$ .
Give appropriate units.

$A$ = ______
$B$ = ______

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

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