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Velocity-time graph of ball thrown up with air resistance - Part 2
Refer to the video below for the explanation. Related post: Velocity-time graph of ball released from rest with air resistance - Part 1...
Evan Toh
Sep 26, 20251 min read
Velocity-time graph of ball released from rest with air resistance -Part 1
Refer to the video below to understand how to sketch the graph. For O-Level, we just need to focus on the general shape. 2024PP Paper 2...
Evan Toh
Sep 26, 20251 min read
Find the density of liquid from a pressure-depth graph.
Liquid pressure P = pgh P is pressure in pascal (Pa) p is the density of the liquid (kg/m3) g is gravitational field strength (10 N/kg) h...
Evan Toh
Sep 8, 20251 min read
What is the numerical value of ratio of c/C？PP2020P1Q20
C is the heat capacity of a body. It is the amount of internal energy transferred to a body per unit change in temperature. (Or for 1...
Evan Toh
Sep 8, 20251 min read
Light - TIR - Find the refractive index of the liquid
Answer: Option D For total internal reflection TIR to occur, two conditions must be present: 1. light must be travelling from a optically...
Evan Toh
Jul 30, 20251 min read
Liquid Pressure - Determine the pressure of the enclosed air in the manometer (pure physics)
Answer: Option A Refer to the video explanation
Evan Toh
Jul 30, 20251 min read
Evan Toh
Dec 13, 20240 min read
Evan Toh
Dec 13, 20240 min read
Evan Toh
Dec 12, 20240 min read
Radioactivity - Questions on Penetrating Ability and Applications
2002PPQ38, 2003PPQ38, 2005PPQ37, 2006PPQ38, 2007PPQ39 Answer: Option B Answer: Option D Answer: Option B Answer: Option C Answer: Option...
Evan Toh
Nov 7, 20241 min read
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...
Evan Toh
Nov 4, 20241 min read
What happens to frequency and speed of water wave as it goes to shallow region? 2019PPp1q23
Once the wave is produced, the frequency remains constant. Hence speed V of the wave is directly proportional to the wavelength of the...
Evan Toh
Nov 4, 20241 min read
Evan Toh
Nov 4, 20241 min read
2007PPp1q28 2019PPp1q33 - Which V-I readings are for torch lamp?
2019PPP1Q33 Ans: Option B 2007PPP1Q28 Ans: Option B Torch lamp or bulb is a non-ohmic conductor . The V-I graph has an increasing...
Evan Toh
Oct 25, 20241 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...
Evan Toh
Oct 23, 20241 min read
2016PPP1Q40 – Voltage and Power of Bulb Y when X is switched off - 2013PPP1Q40 heaters
2016PPP1Q40 Solutions: Option C [There is another similar question in 2013 Nov Pure Physics P1Q40. The answer is Option C too. Refer to...
Evan Toh
Oct 22, 20241 min read
Using P = I^2R and P = V^2/R to explain which component uses the highest power or energy.
Instead of P = IV to explain, it might be easier to explain using P = I^2R when the components are connected in series where current I is...
Evan Toh
Oct 21, 20241 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,...
Evan Toh
Oct 21, 20241 min read
Evan Toh
Oct 21, 20240 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)...
Evan Toh
Oct 20, 20241 min read
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