CAIE Physics (9702)

In this experiment, you will investigate a balanced metre rule. You have been provided with a metre rule and some masses. seven 10 g masses100 g mass bench 50 cm mark on metre rulea a 10 g mass Measure and record a. a = throughout the experiment. [1] * 0019654982602 *, , mass near the end of the rule. pivot adhesive putty fixed 10 g mass n 10 g masses Record n and y. n = y = [1] * 0019654982603 *, ,

Change n by moving some of the 10 g masses from the centre of the rule onto the 10 g mass near the end of the rule and determine y. Repeat until you have six sets of values of n and y. Record your results in a table. Include values ofand to three significant figures.

(i) Plot a graph of on the y-axis against on the x-axis.

Draw the straight line of best fit.

Determine the gradient and y-intercept of this line. gradient = y-intercept = [2] * 0019654982604 *, , , ,

It is suggested that the quantities y and n are related by the equation± Q where P and Q are constants. Using your answers in (d)(iii), determine the values of P and Q. Give appropriate units. P = Q =

Theory suggests thatP =9Ma 18M + R where M = 10 g and R is the mass of the rule. Determine the value of R. R = g [1] [Total: 20] * 0019654982606 *, , You may not need to use all of the materials provided.

In this experiment, you will investigate the properties of a rubber band. rod of clamp rod of clamp bosses rubber band stand bench The distance between the ends of the rubber band is L , as shown in Fig. 2.1. Measure and record L =

Estimate the percentage uncertainty in your value of L . Show your working. percentage uncertainty = % [1] * 0019654982707 *, ,

The width of the unstretched rubber band is w and its thickness is t, as shown in Fig. 2.2. Measure and record w and t. = t = [2] the rubber band is approximately 1.5 L The width of the rubber band is w. Measure and record L and w. L = w =

Calculate ΔL and Δw, where ΔL = L ± L and Δw = w ± w. ΔL = Δw =

Justify the number of significant figures that you have given for your value of ΔL. , , L = w = ΔL = Δw =

It is suggested that the relationship between Δw and ΔL is= k where k is a constant. Using your data, calculate two values of k. first value of k = second value of k = [1] * 0019654982709 *, ,

It is suggested that the percentage uncertainty in the values of k is 25%. Using this uncertainty , explain whether your results support the relationship in (e).

The approximate force F acting on the rubber band is given byF = 2Etkw where the Young modulus E of rubber is 1.0 × 10N m Use your second value of k and your value of Δw from

to determ ine a value for F. F = N [1] * 0019654982710 *, ,

(i) Describe four sources of uncertainty or limitations of the procedure for this experiment. For any uncertainties in measurement that you describe, you should state the quantity being measured and a reason for the uncertainty. 1 2 3 4

Describe four improvements that could be made to this experiment. You may suggest the use of other apparatus or different procedures. 1 2 3 4 [4] [Total: 20] * 0019654982711 *, , Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable ef fort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. To avoid the issue of disclosure of answer-related information to candidates, all copyright acknowledgements are reproduced online in the Cambridge Assessment International Education Copyright Acknowledgements Booklet. This is produced for each series of examinations and is freely available to download at www.cambridgeinternational.org after the live examination series. Local Examinations Syndicate (UCLES), which is a department of the University of Cambridge. BLANK PAGE * 0019654982712 *, ,