P3_1_upper_six
3
Physics Paper 3 Upper six Duration: 2hr 1 In this experiment, you will investigate how the current in a circuit varies as the resistance of the circuit is changed. (a) Measure and recor d the length L of wire between the crocodile clips on the wire labelled F. (b) Set up the circuit as shown in Fig. 1.1. + ! crocodile clip metre rule wire crocodile clip Fig. 1.1 (c ) (i ) !ttach w ire F to the wire on the metre rule as show n in Fig. 1 .". + ! x F Fig. 1.2 #he distance x between the crocodile clips should be approximately $% cm. (ii) Measure and record x . (d ) (i ) &lose the switch. 'ii( )ecord the ammeter reading I . 'iii( *pen the switch. (e) &hange x and repeat (c)(ii) and (d) until you have six sets of readings of x and I . 1
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Transcript of P3_1_upper_six
Physics Paper 3 Upper six Duration: 2hr
1 In this experiment, you will investigate how the current in a circuit varies as the resistance of the circuit is changed.
(a) Measure and record the length L of wire between the crocodile clips on the wire labelled F.
(b) Set up the circuit as shown in Fig. 1.1.
Acrocodile clip
metre rule
wirecrocodile clip
Fig. 1.1
(c) (i) Attach wire F to the wire on the metre rule as shown in Fig. 1.2.
A
x
F
Fig. 1.2
The distance x between the crocodile clips should be approximately 50 cm.
(ii) Measure and record x.
(d) (i) Close the switch.
(ii) Record the ammeter reading I. (iii) Open the switch.
(e) Change x and repeat (c)(ii) and (d) until you have six sets of readings of x and I.Include values of and in your table.(f) (i) Plot a graph of on the y-axis and on the x-axis.(ii) Draw the straight line of best fit. (iii) Determine the gradient and y-intercept of this line.
(g) The quantities I, x and L are related by the equation
where P and Q are constantsUsing your answers in (f)(iii), determine values for P and Q. Give appropriate units.
2) In this experiment you will investigate the height to which a ball rises when it has been released from a stretched piece of rubber.
a. (i) Suspend the piece of rubber from a clamp and stand using the two small blocks of wood. Attach the ball to the lower end of the rubber. The arrangement should be as shown in Fig. 2.1.
blocks of wood
piece of rubber
ball
Fig. 2.1
(ii) Clamp the rule vertically. Position the rule near to the suspended ball. (iii) Record the position of the centre of mass of the ball when it is in equilibrium.
b) (i) Pull the ball vertically downwards. Record the new position of the centre of mass of the ball and determine its vertical displacement x. (ii) Release the ball and note the position of its centre of mass when the ball reaches maximum height. (iii) Calculate the maximum height h of the ball above the equilibrium position.
c) Estimate the percentage uncertainty in h, showing your working.
d) Change the value of x and repeat (b). Record the new values of x and h.
e) It is suggested that h is directly proportional to . Do the results of your experiment support this idea? You should explain your reasoning clearly.
f) (i) State four sources of error or limitations of the procedure in this experiment.
(ii) Suggest four improvements that could be made to this experiment. You may suggestthe use of other apparatus or different procedures.1
