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2.1and
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1.1he rate of change of momentum of an object is equal to the impulse on the object. net force acting on the object. product of the object
1.2The gravitational acceleration on the surface of planet with mass M and radius is The g
1.3The graph bel ow shows how one of the physical quantities associated with an object in free fall changes with time t. The label o the y axis is omitted.
1.4A ball of mass , falling vertically downwards, hits the floor at a speed and bounces vertically upwards at
1.5The base SI unit of the physical quantity 'work' is
1.6The siren of a police car, moving in front of a truck, emit sound waves of frequency
1.7Two identical metal spheres, and , on insulated stands carry different charges. The spheres are brought
1.8An AC generator generates a current with a frequency of 5 0 Hz. The number of times th at the maximum (peak\ current is
1.10he sodium cathode of a photocell is irradiated with ultraviolet light as shown in the diagram below. The ammeter register
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2.1Define the term normal force (2\
2.2Draw a labelled free body diagram of the 20 kg block. (5\
2.3Calculate the combined mass of the two blocks. (5\
2.4At a certain stage of the motion, block breaks off and falls down. How will EACH of the following be affected when this happens?
2.4.1The tension in the string Choose from INCREASES, DECREASES or REMAINS TH E SAME. (1\
2.4.2The velocity of the 20 kg block Explain the answer. (3\ [16] 35 N 4016
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3.1Define the term free fall (2\ 3. Use the graph and determine:
3.2.1 The time that the ball is in contact with the floor bef ore the first
3.2The time it takes the ball to reach its maximum height after the first bounce (2\
3.2.3 The speed at which the ball le aves the floor at the first bounce
3.2ime indicated on the graph
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4.1Define the term momentum in words. (2\
4.2Calculate the:
4.2.1Velocity of ball after the collision (5\
4.2.2Magnitude of the impulse on ball during the collision (3\ [10]10
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5.1Define the term non conservative force (2\
5.2Calculate the change in the kinetic energy of the car after it has travelled from point to point
5.3Use energy principles to calculate the height (4\ On reaching point , the car
5.4Calculate the power delivered by the engine to move the car from point to point
6.1State the Doppler effect in words (2\
6.2Does the detector record the fr equency of 3 148 Hz when the train moves TOWARDS the detector or AWAY
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7.2Calculate the magnitude of the electrostatic force exerted by sphere on sphere (3\
7.3Describe the term electric field (2\
7.4Calculate the m agnitude of the net electric field at point (5\ Charged spheres and
8.1Define the term emf of a battery. (2\ The reading on the voltmeter DECREASES by ,5 V when switch is closed.
8.2Give a reason why the voltmeter reading decreases. (2\ 8. Calculate the following when switch is closed: 8.
8.3.2Total external resistance of the circuit (4\ 8. .3 Emf of the battery (3\ 8.
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9.1simplified diagram of an electrical machine is shown below.
9.1.1Is this machine a DC motor or a DC generator? (1\
9.1.2Write down the energy conversion that takes place wh ile this machine is in operation (2\
9.1Write down the n ame of component in the diagram. (1\
9.1In which direction will the coil , shown in the diagram above rotate? Choose from
9.2An electric al device is marked 200 W ; 220 V.
9.2.1Define the term rms voltage (2\
9.2Calculate the resistance of the device. (3\ This device is now connected to a 150 V AC source.
9.2Calculate the energy dissipated by the device in 10 minutes (5\
10.4Define the term work function in words. (2\
10.5Calculate the:
10.5.1Work function of platinum (3\
10.5.2requency of the inci dent light that will emit electrons from the surface of platinum with a maximum velocity of 5,60 x 10