2024 Prelim ACSBR P3 QP + MS

Name: Class: Class Index No.: Anglo-Chinese School (Barker Road) PRELIMINARY EXAMINATION 2024 SECONDARY FOUR EXPRESS PHYSICS 6091 PRACTICAL 1 HOUR 50 MINUTES INSTRUCTIONS TO CANDIDATES: Write your name, class and exam index number on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. Read the instructions carefully. The number of marks is given in the brackets [ ] at the end of each question or part question. This question paper consists of 13 printed pages. For Examiner’s Use Q1 Q2 Q3 Total 40

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 2 Secondary 4 Express Physics 6091 Paper 3 Section A 1 In this experiment, you will investigate an electric motor. You have been provided with • a battery • a switch • an ammeter • a length of resistance wire attached to a metre rule • an electric motor clamped to a stand • a piece of thin card • a voltmeter • connecting leads • a jockey Assemble the circuit shown in Fig. 1.1. Fig. 1.1 The jockey can be connected at different points along the length of the resistance wire. You are also provided with: • a load made from a 50 g mass hanger and three 50 g masses • an elastic band.

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 3 Secondary 4 Express Physics 6091 Paper 3 Place the shaft of the motor through the elastic band and suspend the load from the elastic band. Put the piece of thin card onto the shaft of the motor, as shown in Fig. 1.2. Fig. 1.2 Tilt the motor very slightly, as shown in Fig. 1.3, to ensure that the elastic band does not slip off when the shaft of the motor is turning. Fig.1.3 Close the switch. Connect the jockey to the resistance wire. Adjust the position of the jockey until the shaft of the motor rotates as slowly as possible without stopping. The piece of thin card can help you judge when the motor starts to rotate.

Anglo-Chinese School (Barker Road) Preliminary Examination 2024 4 Secondary 4 Express Physics 6091 Paper 3 (a) Record the potential difference V across the motor and the current I in the circuit. V = ……………………………… I = ……………………………… [2] (b) Open the switch. Disconnect the jockey from the resistance wire. Calculate: (i) the power P input to the motor, using the equation P = V I P = ……………………………… [1] (ii) the ratio R of the potential difference to the current, using the equation R = V I . R = ……………………………… [1] (c) Remove one 50 g mass from the load. Close the switch. Connect the jockey to the resistance wire. Adjust the position of the jo