Physics 9702/34 — May/June 2020

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 balance of a pivoted rule.

(a)

The apparatus has been partially assembled for you.

● Add the mass M to the apparatus as shown in Fig. 1.1. The mass M should be suspended approximately $15\text{ cm}$ from the nail.

Fig. 1.1

● The distance between the nail and the string loop attached to M is $d$ , as shown in Fig. 1.1.

Measure and record $d$ .

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

(b)

● Pour water into the syringe until it is full. The rule will tilt until it touches the upper stop. The water will flow out of the syringe.

● The time between the water level passing the $50\text{ cm}^3$ mark on the syringe and the rule losing contact with the upper stop is $t$ .

Measure and record $t$ .

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

(c)

Change $d$ by moving M. All values of $d$ should be less than $25\text{ cm}$ .

Measure $d$ and $t$ . Repeat until you have six sets of values of $d$ and $t$ .

Record your results in a table. Include values of $\frac{1}{d}$ and $t^2$ in your table.

(d)

(i)

Plot a graph of $t^2$ 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)

It is suggested that the quantities $t$ and $d$ are related by the equation

t^2 = \frac{a}{d} + b

where $a$ and $b$ are constants.

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

$a$ = ______

$b$ = ______

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