Centrifuge Toy
I designed this 3D teaching tool using Tinkercad and printed it out so that my colleague can use it to demonstrate the effect of a centrifuge. As the toy is being spun, the ball...
07 Circular Motion
3D printed teaching aids
I bought a Creality Ender 3D printer in 2020 (going at about $270 at Lazada now), at the height of the pandemic and have been using it to print physics-related teaching aids for a...
Non-Uniform Vertical Circular Motion
Using a chain of rubber bands, I swung a ball around in a vertical loop. This demonstration shows how the tension in an elastic band changes according to the position of the ball,...
Centripetal force on and off
Here's a quick video to demonstrate the movement of a ball initially moving in a circle before its centripetal force (contact force by the circular wall) is removed. The ball is...
Angular velocity
This GeoGebra app shows how angular velocity ω is the rate of change of angular displacement (i.e. $\omega=\dfrac{\theta}{t}$) and is dependent on the speed and radius of the...
Angular displacement
This GeoGebra app shows the relationship s = rθ . One activity I get students can do is to look at the value of θ when the arc length s is equal to the radius r . This would give...
Uniform vertical circular motion
The following GeoGebra app simulates the force vectors on an object in uniform vertical circular motion. A real world example of this would be the forces acting on a cabin in a...
Vertical Non-Uniform Circular Motion
This is a simulation that shows the vectors of forces acting on an object rolling in a vertical loop, assuming negligible friction. To complete the loop, the initial velocity must...
Aircraft Turning in a Circle: a 3-D Visualisation with GeoGebra
This GeoGebra app is a 3-D visualisation tool of the force vectors acting on an aircraft turning with uniform circular motion in a horizontal plane. I prepared this in advance as...
Cardboard Boomerang
A indoor boomerang can be constructed using 3 strips of cardboard put together. Throwing it may require some practice though but when you get the hang of it, it can inject great...
Angular Displacement - 2011 A-level question
A disc rotates clockwise about its centre O until point P has moved to point Q, such that OP equals the length of the straight line PQ. What is the angular displacement of OQ...