Evan Toh
2008PPp1q15,2017PPp1q15– Pressure constant, rate of collision decreases
When gas in piston and heated but pressure remains constant. It is easier to explain in terms of the average force acting on a unit area....
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Evan Toh
Dec 31, 20231 min read
Two conditions for a body to be in equilibrium
When a system is in equilibrium , 2 conditions are met. 1) Principle of Moment (POM): Sum of anticlockwise moment = Sum of clockwise...
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Evan Toh
Dec 31, 20231 min read
Total Internal Reflection (TIR) example 01
Solutions: a) Refraction b) 48.6o c) c = 41.8o e) 70o d) Total internal reflection has occured, as the angle of incidence is...
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Evan Toh
Dec 31, 20231 min read
Why the fuse and switch must be on the live wire?
A common mistake is to state that the reason for switch to be on the live wire is “so that the switch can turn on/off the appliance”....
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Evan Toh
Dec 31, 20232 min read
Converging Lens Overview
1. Converging lens (convex lens) Converging lens, also known as convex lens, is thicker at the centre. Below shows some examples. In...
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Evan Toh
Dec 31, 20230 min read
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Evan Toh
Dec 31, 20231 min read
Different Lens Ray Diagram questions
Drawing ray diagrams for converging lens come in many forms. But the basic concepts needed are the 3 rays (which have rules to follow) to...
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Evan Toh
Dec 31, 20231 min read
Distance-time and Speed-time graph of 2 objects in motion
The distance-time (displacement-time) graph on the left is not related to the speed-time (velocity-time) graph. Both are of difference...
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Evan Toh
Dec 31, 20231 min read
Kinematics Basic Concepts
01 The various physical quantities in kinematic Video tutorial 02: Acceleration Video tutorial 03: Graphical Analysis of Motion...
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Evan Toh
Dec 31, 20231 min read
Finding total effective resistance
For resistors connected in series, the total resistance is the sum of all resistance. Re = R1 + R2 + R3 For resistors in parallel, the...
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Evan Toh
Dec 31, 20230 min read
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Evan Toh
Dec 31, 20231 min read
Why do we need earth wire and fuse?
Simply put, electric appliance can be very simple with just a live wire bring in the current and a neutral wire to bring the current out....
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Evan Toh
Dec 31, 20231 min read
Vernier caliper and Micrometer screw gauge
Vernier caliper and micrometer screw gauge are used to measure length. Vernier caliper is used in general for measuring length...
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Evan Toh
Dec 31, 20230 min read
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Evan Toh
Dec 31, 20232 min read
2013SPp2q9 – Pressure and Moment
Solutions: (a) (i) A bigger force than F can be obtained due to the lever system and hydraulic system . Lever system: Applying...
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Evan Toh
Dec 31, 20231 min read
PP2008Q11OR Thermistor in series with fixed resistor, explanation on pd and graph
As both the fixed resistor and the thermistor are connected in series, the sum of potential difference across them will be equal to the...
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