Evan Toh
Function of Fuse
Fuse is a safety feature. In the event of an electrical fault, where there is a short circuit current which exceeds the fuse rating, the...
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Evan Toh
Dec 31, 20231 min read
Understanding Free-Fall (acceleration due to gravity)
On earth, the gravitational field strength is 10 N/kg and the acceleration due to gravity is 10 ms-2 . That means when you release an...
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Evan Toh
Dec 31, 20232 min read
Different Types of Vector Diagrams
Vector diagram is commonly referred to parallelogram diagram . Vector diagrams are generally divded into 3 categories: 1) 2 forces...
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Evan Toh
Dec 31, 20231 min read
Oscillating or Vibrating Object in a Wave Motion
When an object is oscillating or vibrating in a wave motion , the speed of the object varies along the path. In this video, there are...
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Evan Toh
Dec 31, 20231 min read
Using barometer to estimate height of mountain
At sea-level, the barometer which Pie is holding reads 760 mm of Hg. When he is at the top of Mount Pie, the same barometer reads 230 mm...
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Evan Toh
Dec 1, 20231 min read
Boy on spring board - Moments Question using Simultaneous Equations
Note: Non-uniform plank means the CG of the plank is not at its centre a) Find the weight of the boy. b) How far is the centre of gravity...
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Evan Toh
Nov 30, 20231 min read
Sound – Pitch and Loudness
Pitch of the sound depends on the frequency [Higher frequency -> Higher pitch] Loudness of the sound depends on the amplitude [Higher...
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Evan Toh
Nov 30, 20231 min read
Modification to ammeter to measure bigger current
Sensitivity of the ammeter means that how small a current the ammeter can measure. Example, if the original set up is 0.2 A per division,...
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Evan Toh
Nov 30, 20231 min read
Demonstration of Reflection, Refraction and TIR using light source with a slit
Reflection of light using a mirror Refraction of light using various shaped optical mediums Total Internal Reflection (TIR) using a...
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Evan Toh
Nov 30, 20231 min read
Sketching P-V, P-1/V and PV-P graph
Pressure of a fixed mass of gas, P, is inversely proportional to the volume of the gas, V, when the temperature is held constant. P...
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Evan Toh
Nov 30, 20231 min read
Transverse Waves and Longitudinal Waves Simulations
Transverse waves are waves in which the direction of the wave is perpendicular to the direction of the vibration . e.g Light, water,...
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Evan Toh
Nov 30, 20231 min read
Endoscope - Refractive Index
Using the formula n = 1/sin c, the higher the n , the smaller the c . With smaller c , total internal reflection can occur over a wider...
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Evan Toh
Nov 30, 20231 min read
Minimum force to lift a drum over a step (different examples)
Given that the mass of the drum is 20 kg. What is the minimum force, F, required to just movee th drum off the ground? (Assume uniform...
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Evan Toh
Nov 30, 20230 min read
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