This simulation allows students to observe the variation of the normal contact force N acting on a box placed on a frictionless slope with the angle of inclination of the slope changing. It also allows them to see how the Weight vector W can be resolved into two components, with the one perpendicular to the

# Author: Seng Kwang

## Man in Elevator Simulation

In this simulation, students can observe the variation of the normal contact force (N) and its effect on acceleration and velocity as an elevator moves upward. Questions for students to work on can include: Express the acceleration as a function of Normal Contact Force (N), Weight (W) and mass of the man. Determine the distance travelled

## Internal Resistance and Maximum Power Theorem

I've created this simulation to demonstrate the effect of an internal resistance due to a cell on the potential difference and current of an external load. One can also vary the internal resistance and external resistance to observe the maximum power theorem. The theorem states that for a given finite internal resistance, one can obtain

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## Variable Resistor Simulation

My third simulation in as many days. This time round, I created some png files for electrical circuit components that can be used for future simulations. I also figured out how to add text in line with a variable in the drawing panel for the simulation, hence the units can now follow the values of

## Simulation for Potentiometer

Continuing the course on Easy Java Simulation, I did this simple simulation on the Potentiometer, which allows students to first predict, and then verify the position of a jockey to achieve null deflection of a galvanometer. Click on the image below to try it out and do give me your feedback. I'll try to improve

## Vertical Throw with Free Fall Simulation

This is a simulation done from scratch after attending a crash course on EJSS. It displays the velocity and acceleration vectors as an object is projected vertically upward with a uniform downward acceleration. The initial upward velocity can be altered using a slider. The graph of velocity is traced as the ball moves. http://physicslens.com/ejss/verticalthrow_Simulation.xhtml

## Getting Tides Right

I was reading up on tides this morning as I have to relieve a colleague's IP2 class on forces, when I stumbled upon this video. It explains tides in a way that differs from most textbooks that clarified for me why the oceans bulge at both ends along the Moon-Earth line at the 2'30" mark onwards.

## Stirling Engine

I bought a simple beta Stirling engine online at dx.com recently and it came in the mail today. It works well with a cup of hot water placed under it, although it might take a little push to get it started due to the initial static friction. However, once it starts spinning, the wheel goes on

## Chladni Plates

A very good explanation of standing waves on Chladni plates. Watch out for the 3-Dimensional standing wave at 3'11''.

## LEGO Pendulum Clock to Demonstrate Oscillation Concepts

This is the Pendulum Clock from the LEGO Education Simple and Powered Machines Set. It can be used to demonstrate the variation of period with length of pendulum and is a very good visual representation of the escapement mechanism. There are many other models that one can build using this set, including a weighing scale, elastic

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