Quick Revision 2/8

When a thermistor is connected in series with a fixed resistor, how to explain the p.d. varies as resistance temperature changes?

Evan Toh

Oct 211 min read

When a thermistor is connected in series with a fixed resistor, how to explain the p.d. varies as resistance temperature changes?

When two components are connected in series, where one is a fixed resistor and the resistance of the other can vary (e.g. thermistor,...

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Basic Concepts on DC Circuit – River System

Evan Toh

Oct 211 min read

Basic Concepts on DC Circuit – River System

The ‘D.C.’ here mean direct current . It means that the current flows in one direction in the circuit . The direction of the direct...

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Factors that affect the resistance of a conductor

Evan Toh

Oct 211 min read

Factors that affect the resistance of a conductor

In general, assuming temperature of a conductor is constant, the resistance of a conductor is affected by 1) length (L) – [L increases, R...

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What is Total Internal Reflection (TIR)?

Evan Toh

Oct 211 min read

What is Total Internal Reflection (TIR)?

Overview of Total Internal Reflection (TIR) Explanation of the various stages:

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Minimum force F to push barrel up a step

Evan Toh

Oct 201 min read

Minimum force F to push barrel up a step

Answer: Option D

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Video 02 Finding resultant force from vector diagram provided

Evan Toh

Oct 201 min read

Video 02 Finding resultant force from vector diagram provided

(1) 2003PPq1q7 (0 min to 2.42 min) Ans: Option A (2) 2023PPp1q4 (2.47 min 3.54 min) Ans: Option C (3) 2018PPp1q2 (3.45 min to 6.22 min)...

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Video 01 How to find resultant force of two or three forces (without drawing vector diagram)

Evan Toh

Oct 201 min read

Video 01 How to find resultant force of two or three forces (without drawing vector diagram)

Below are some examples of questions that involve finding the resultant force due to two or three forces. Below are the questions in the...

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Evan Toh

Oct 201 min read

Finding Forces on Multiple Bodies

(1) (2) (3) (4)

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Evan Toh

Oct 180 min read

Radioactivity Summary

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What if wires in the 3-pin plug are swapped?

Evan Toh

Oct 170 min read

What if wires in the 3-pin plug are swapped?

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Evan Toh

Oct 170 min read

Static Electricity basic concepts

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Main 4 types of images formed by a thin converging lens

Evan Toh

Oct 170 min read

Main 4 types of images formed by a thin converging lens

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Why wind surfer leans outward when the wind speed increases? – moments

Evan Toh

Oct 160 min read

Why wind surfer leans outward when the wind speed increases? – moments

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Evan Toh

Oct 160 min read

Will it topple? How to explain?

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Evan Toh

Oct 161 min read

Balancing Toys

There are two main types of balancing toys. Type 01: CG below the pivot point Type 02: CG above the pivot

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Turning Effect of Forces – Basic Concepts

Evan Toh

Oct 161 min read

Turning Effect of Forces – Basic Concepts

This video goes through the basic concepts that is required for moment questions. Go through the whole video to have know the different...

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2015 PurePhy P1Q6 – Using Newton’s 3rd Law to find Forward Thrust

Evan Toh

Oct 161 min read

2015 PurePhy P1Q6 – Using Newton’s 3rd Law to find Forward Thrust

Refer to this MCQ from PurePhysics 2015P1Q6 Answer: Option C

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Evan Toh

Oct 161 min read

Action-Reaction: Newton’s 3rd Law

Take note how to phrase the action-reaction pair, and also the differences and similarities of a action-reaction pair.

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Direction of Frictional Force on Tyre or Wheel

Evan Toh

Oct 161 min read

Direction of Frictional Force on Tyre or Wheel

For these type of questions, it is important to identify which tyre/wheel is connected/powered by the engine or the person. On each tyre...

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Understanding Newton’s 1st and 2nd Laws of Motion

Evan Toh

Oct 161 min read

Understanding Newton’s 1st and 2nd Laws of Motion

1) Newton’s first law states that an object will remain at rest or in uniform motion (constant speed) in a straight line unless an...

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