You may not need to use all of the materials provided. In this experiment, you will investigate forces on a wooden strip in equilibrium. (i) Assemble the apparatus as shown in Fig. 1.1, with the mass resting on the bench. (ii) Adjust the height of the boss and the position of the mass until the wooden strip is parallel to the bench and the springs are vertical. (iii) Measure and record the lengths $l_1$ and $l_2$ of the coiled sections of the two springs, as shown in Fig.…

Physics 9702/33 — February/March 2017

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 forces on a wooden strip in equilibrium.

(a)

(i)

Assemble the apparatus as shown in Fig. 1.1, with the mass resting on the bench.

Fig. 1.1

(ii)

Adjust the height of the boss and the position of the mass until the wooden strip is parallel to the bench and the springs are vertical.

(iii)

Measure and record the lengths $l_1$ and $l_2$ of the coiled sections of the two springs, as shown in Fig. 1.1.

$l_1$ = ______
$l_2$ = ______

(b)

You are provided with a wire hook and some metal rings. The card shows the mass of the hook and the mass of one ring.

(i)

Hang the hook and about half the rings from string loop Y.

(ii)

Repeat (a)(ii) and (a)(iii).

$l_1$ = ______
$l_2$ = ______

(iii)

Using the data from the card, calculate the total mass $m$ hanging from string loop Y.

$m$ = ______

(c)

Change $m$ by altering the number of rings on the hook, and repeat (a)(ii), (a)(iii) and (b)(iii) until you have six sets of values of $m$ , $l_1$ and $l_2$ .

Record your results in a table.
Include values of $(l_2 - l_1)$ in your table.

(d)

(i)

Plot a graph of $(l_2 - l_1)$ on the $y$ -axis against $m$ 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 $l_1$ , $l_2$ and $m$ are related by the equation

(l_2 - l_1) = am + b

where $a$ and $b$ are constants.

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

$a$ = ______
$b$ = ______

(f)

The spring constant $k$ of each spring can be found using the relationship

k = \frac{g}{a}

where $g = 9.81\ \text{N kg}^{-1}$ .

Calculate $k$ .

$k$ = ______

The rest of this paper

1 more questions

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

Loading the full paper…