paper 3 physic trial
TRANSCRIPT
-
8/13/2019 Paper 3 Physic Trial
1/32
Paper 3 physicspm
-
8/13/2019 Paper 3 Physic Trial
2/32
19. Diagram 4.1 and Diagram 4.2 show an identical bulbs connected to the conductor
wires of identical length but of different thickness. When the power supply is switched
on, the bulbs lighted with different brightness.
(a) State one suitable inference
(b) State one hypothesis that could investigated.
Resistance// brightness of bulb depends on the diameter/thickness of the conductor
wire
When the diameter/thickness increase, the resistance decrease
-
8/13/2019 Paper 3 Physic Trial
3/32
(c) With the use of apparatus such as a dry cells, constantan wire and other
apparatus, describe one experiment to investigate the hypothesis stated in 4(b).
(i) To investigate the relationship between the diameter /thickness of the conductor
wire and resistance
(ii) Manipulated : diameter / thickness
Responding : resistance / voltage
Constant : length of conductor
(iii) Dry cells, insulated constantan wire, connector wire,
ammeter, voltmeter, rheostat , switch, meter rule
(iv)
-
8/13/2019 Paper 3 Physic Trial
4/32
(v)
1. A 20 cm length of constantan wire of diameter of 0.1 mm is connected to a circuit as
shown in diagram above.
2. Adjust the rheostat and until the ammeter reading is I = (0.2A).
3. Measure the corresponding reading on the voltmeter, V4. Calculate the resistance of conductor using formula ; R = V/I
5. Repeat step 1 to 4 with the diameter of constantan wire , 0.2 mm , 0.3 mm, 0.4mm
and 0.5mm.
(vi)
(vii)
Diameter, mm Voltmeter, V R = V/I
0.1
0.2
0.3
0.4
0.5
-
8/13/2019 Paper 3 Physic Trial
5/32
-
8/13/2019 Paper 3 Physic Trial
6/32
a) The depth of water affects the position of the image of the coin // The position of
the image depends on the depth of the water
b) The more the depth of the water is, the more the position/ apparent depth of the
image.
c) i) To investigate the relationship between real depth and apparent depth/ position
of the coin
ii) Manipulated Variable : The depth of water
Responding variable : The position of the image / The apparent depth
constant variable : the type of liquid / The type of beakeriii) Tall beaker, water, pins, set of retort stand and metre rule
-
8/13/2019 Paper 3 Physic Trial
7/32
iv)
Set up the apparatus as above// A pin is placed at the base of a beaker.
Aother pin is clamped to the retort clamp outside the beaker
-
8/13/2019 Paper 3 Physic Trial
8/32
v) State the method to control the manipulated & responding variable
1.fill a beaker with water to a depth of 10cm
2.move the pin outside the beaker to obtain the apparent position of the pin in beaker
3.record the position of the pin from the surface of the water to the pin using ruler.4.repeat step 1 to 3 by increase the depth of the water : 12 cm, 14cm, 16 cm, and 18 cm
vi)Depth of water, d/cm Apparent depth, d/cm
10
12
14
16
18
vii) Plot a graph of apparent depth against the depth of the water
-
8/13/2019 Paper 3 Physic Trial
9/32
Sin r directly proportional to sin i
Sin 26.7= 0.45
Sin r = 0.3
r = 17.5
-
8/13/2019 Paper 3 Physic Trial
10/32
Ray box must be arranged exactly on the
Angle of Incidence line .
-
8/13/2019 Paper 3 Physic Trial
11/3227.3
increase as c decrease
-
8/13/2019 Paper 3 Physic Trial
12/32
The liquid is constantly stirred throughout
the experiment so that the liquid is heated
evenly
-
8/13/2019 Paper 3 Physic Trial
13/32
Mass of liquid
Temperature of liquid
Specific heat capacity of the liquid /
Type of liquid
increase with 1/m increase
1/m
-
8/13/2019 Paper 3 Physic Trial
14/32
-
8/13/2019 Paper 3 Physic Trial
15/32
The velocity of the sea waves changes when the wave approach an
area which is shallow
The velocity of the refracted waves smaller than the velocity of the
incident waves.
-
8/13/2019 Paper 3 Physic Trial
16/32
To study the relationship between the velocity of refracted waves with velocity of incident waves
ii) manipulated variable : depth of water
responding variable : wavelength
constant variable : frequency of the source of waves
iii) power source, ripple tank, a transparent glass plate,stroboscope, a piece of white paper, metre ruler,
wooden bar fitted with the vibrator motor
-
8/13/2019 Paper 3 Physic Trial
17/32
iv)
v) 1. The transparent glass plate is placed at the centre of the ripple tank so that
the water on top of its surface is the region of shallow water.
2. The image of the plane waves in the region of shallow water is observedthrough a stroboscope that freezes the propagation of the waves
3. Using metre ruler, the wavelength of the wave for the deep and shallow
region is measured.
4. The experiment is repeated by increasing the depth of water.
-
8/13/2019 Paper 3 Physic Trial
18/32
vi) Wave pattern for shallow water region
Wave patter for deep water region
vi) The wavelength of water of the deep water region is longer than the wavelength
of water of the shallow water region.
-
8/13/2019 Paper 3 Physic Trial
19/32
Inertia balance
The period of oscillations is in a linear proportion
to the number of metal rods.
-
8/13/2019 Paper 3 Physic Trial
20/32
T = 2.7s
Number of metal rods = 2
The mass of object = 2 x 0.05= 0.1 kg
Decreases
The balance of table is horizontally to
avoid gravitational pullEach experiment is repeated twice to
obtain the average value
-
8/13/2019 Paper 3 Physic Trial
21/32
-
8/13/2019 Paper 3 Physic Trial
22/32
-
8/13/2019 Paper 3 Physic Trial
23/32
-
8/13/2019 Paper 3 Physic Trial
24/32
-
8/13/2019 Paper 3 Physic Trial
25/32
The length of constantan wire
0.4 V 0.9 V
1.3V 1.7 V
2.2 V
-
8/13/2019 Paper 3 Physic Trial
26/32
The resistance of the wire / The potential difference across the wire
The diameter of the wire / The type of wire / The value of current
Diagram 1.2 = 0.8
Diagram 1.3 = 1.8 Diagram 1.4 = 2.6
Diagram 1.5 = 3.4
Diagram 1.6 = 4.4
The resistance of the wire, R, is directly proportional to the length of the wire, l
-
8/13/2019 Paper 3 Physic Trial
27/32
Aim: To investigate the relationship between the angle of
-
8/13/2019 Paper 3 Physic Trial
28/32
Aim: To investigate the relationship between the angle of
incidence and the angle of refraction, and to determine the
refraction index of glass.
-
8/13/2019 Paper 3 Physic Trial
29/32
Aim: To investigate the relationship between the object distance
-
8/13/2019 Paper 3 Physic Trial
30/32
Aim: To investigate the relationship between the object distance
(u), image distance (v), and focal length (f) of a lens
-
8/13/2019 Paper 3 Physic Trial
31/32
-
8/13/2019 Paper 3 Physic Trial
32/32