Evan Toh
Copper spheres P and Q, P has larger volume. What quantity is the same? 2020PP01q7
This question is very straight forward. As both P and Q are copper, the density will be the same. But many are unsure of KE. Let look at...
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Evan Toh
Nov 41 min read
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Evan Toh
Oct 221 min read
2020PPp1q9 moments – Find force P acting on stick by shoulder
Using the concepts that POM, we know 1) Ma = Mc 2) net force on the stick is 0N. Most of us will most likely to take pivot about P as...
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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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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 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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