Problems with Vectors at an Angle
Why angles matter in physics Many physical quantities depend not only on the size of a force, but also on its direction. A force can be resolved into components, produce a turning...
02 Force and Moments
Turning Effect due to Non-Perpendicular Forces
When applying the principle of moments to calculate the magnitude of a force creating a turning effect, where the force is not perpendicular to the length of the object, there are...
Tensegrity Explained
There is a new internet trend called "tensegrity" - an amalgamation of the words tension and integrity. It is basically a trend of videos showing how objects appear to float above...
Equilibrium of a Wall Shelf
This GeoGebra interactive allows students to vary the position of the centre of gravity of a shelf in order to observe the changes of the other two force vectors. The position of...
Forces in Equilibrium
While preparing for a bridging class for those JAE JC1s who did not do pure physics in O-levels, I prepared an app on using a vector triangle to "solve problems for a static point...
Forces on a ladder on a wall
A ladder rests on rough ground and leans against a rough wall. Its weight W acts through the centre of gravity G . Forces also act on the ladder at P and Q . These forces are P...
Using Loom and GeoGebra to explain a tutorial question
It's Day 1 of the full home-based learning month in Singapore! As teachers all over Singapore scramble to understand the use of the myriad EdTech tools, I have finally come to...
Lesson Plan for Online Lecture on Forces
I am using this post as a way to document my brief plans for tomorrow's Google Meet lecture with the LOA students as well as to park the links to the resources and tools that I...
Hydrostatic Pressure and Upthrust
This app is used to demonstrate how a spherical object with a finite volume immersed in a fluid experiences an upthrust due to the differences in pressure around it. Given that...
Centre of Gravity and Stability - Geogebra App
This Geogebra app allows students to explore how the position of the centre of gravity as well as the width of its base affect the stability of an object.
How Does Siphoning Work?
A siphon operates through the combined effects of gravity and air pressure, which work together to move liquid from a higher elevation to a lower one. Gravity is the primary force...
Water in an Inverted Cup
This demonstration can be modified for use as a magic trick. Materials: Glass of water Piece of cardboard that is larger than the mouth of the glass. Procedure: Fill the glass up...
Hanging Forks
This simple demonstration can be done anywhere at home using the following items: an empty glass a toothpick two forks The video below demonstrates how to do it. When the forks...
Cartesian Diver
Ever wondered how a submarine sinks and floats? The demonstration here can be used to explain the changes in forces involved and is going to impress most people who see it for the...