the world in a different light
Direct link to GeoGebra: https://www.geogebra.org/m/e87sbuy8
I translate the wonderful applet done by Gilles Claudel at https://www.geogebra.org/m/AXY9QRs5 from French into English and customised it for the Singapore curriculum.
This is a common example used in the JC1 topics of Oscillations, where if one were to look at an object moving in circles from the side view, it will appear to move in simple harmonic motion. This simple 3D animation allows users to rotate the view to see exactly that. Right click and drag to rotate the view. If you are using a mobile device, use two fingers to drag.
To access the animation in full screen, visit https://www.geogebra.org/m/tsz95u6p
This displacement-time graph is used in conjunction with an SLS package to help students learn how to describe motion of an object and to use gradient of a tangent to calculate the magnitude of velocity.
For a direct link to the app, go to https://www.geogebra.org/m/k3ja7bnm
I added a little spider to help students visualise the movement with time.
I made some refinement to an applet created last year to demonstrate how vector addition can be done either using vector triangle or parallelogram methods.
To access directly in Geogebra, the link is https://www.geogebra.org/m/p2yvdsvs
This new applet is designed for students to practise conversion of common units used in physics on their own. There is a checking algorithm within, which might need some fine-tuning. For full screen view, click here.
The worked solutions given will demonstrate the breakdown of steps that could help students learn the procedure to convert these units.
This little applet is designed to allow students to change the order of magnitude and to use any common prefix to observe how the physical quantities are being written. To view this applet in a new tab, click here.
Standard form (also known as scientific notation) is a way of writing very large or very small numbers that allows for easy comparison of their magnitude by using the powers of ten. Any number that can be expressed as a number, between 1 and 10, multiplied by a power of 10, is said to be in standard form.
For instance, the speed of light in vacuum can be written as 3.00 × 108 m s–1 in standard form.
When a prefix is added to a unit, the unit is multiplied by a numerical value represented by the prefix. e.g. distance = 180 cm = 180 x 10-2 m = 1.80 m
The purpose of using prefixes is to reduce the number of digits used in the expression of values. Hence, students can use the prefix slider to find a user-friendly expression, such as 682 nm instead of 0.000000682 m.
The ten prefixes used are:
| 10-12 | pico |
| 10-9 | nano |
| 10-6 | micro |
| 10-3 | milli |
| 10-2 | centi |
| 10-1 | deci |
| 103 | kilo |
| 106 | mega |
| 109 | giga |
| 1012 | tera |