How to Answer Physics SPM Paper Three
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TIPS FOR PAPER 3
Section A (Structure)
Question no. 2
1. Question based on graph, conceptual or analyzing the graph.
2. Understading the meaning for various shapes of graphs and their characteristics based on y-axis and x-axis.
The example of graph for questions 2
The meaning of graph’s gradient based on the shape and axis (refer to a suitable formula)
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Gradient: acceleration
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Gradient: The rate of change of temperature
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Gradient: mass |
Gradient: acceleration |
3. Draw a smooth extrapolation line if you are asked to do so.
4. Draw a large triangle to calculate the gradient (4 x 4 large square). The triangle should be on tangent line for curve graph.
5. The relationship between responding variable and manipulated variable.
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y is linearly proportional to x. |
y is inversely proportional to x. |
If C ≥1mm from origin (0,0) y is increase linearly to x.
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PRECAUTIONARY STEPS FOR INVESTIGATIVE EXPERIMENTS:
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No |
Type of experiment involving |
Precautions that can be taken |
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1 |
Light |
· Experiment must be carried out in darkened room. · Lens, screen and object must be in line. · Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale of the ruler. |
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2 |
Spring |
· Make sure the spring is not loaded beyond the elastic limit. (spring return to origin length when the load is taking off). · Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale of the ruler. |
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3 |
Electric |
· All connections must be secure/tight. · Switch off the switch after readings are taken to prevent wires from heating up (resistance increase). · Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale of the ammeter/voltmeter. |
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4 |
Heat |
· Liquid must be stirred constantly so that temperature rises evenly. · Alluminium block must be wrapped with insulating material to prevent heat lost. · Thermometer bulb should be smeared with oil to give better thermal contact with the block. · Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale of the thermometer. |
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5 |
Measuring instruments such as ammeter, voltmeter, meter rule |
· Avoid parallax error by placing the eye such that the line of view is perpendicular to the scale of the scale read. · Take into account zero error of instrument. |
Note:
1. Student can give more than one answer for this question. No penalty for the answer which is unsuitable.
2. Unaccetable answer : Avoid parallax error. (without explanation)
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