## Box on a Vertical Oscillating Spring - Geogebra App

﻿ GeoGebra link: https://www.geogebra.org/m/ev62ku7w Students can explore how varying frequency and amplitude of the vertical oscillation of a platform could cause an object resting on it to temporarily leave the platform (i.e. when normal contact force is zero).

## Velocity-Displacement Graph of a Simple Harmonic Oscillator - Animation

﻿ This animation is made using Geogebra. It shows the instantaneous velocity and displacement vectors of a particle undergoing simple harmonic motion while tracing its position on the velocity-displacement graph. It is meant to help student understand why the graph is an ellipse.

## Phase Difference Simulation

I created this simulation for use later this semester with my IP4 classes, to illustrate the concept of phase difference between two oscillating particles.

## 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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## Tacoma Narrows Bridge

This is a video that we usually will show during a lecture on the topic of Resonance, under the unit "Oscillations".  It was taken in 1940 at the Tacoma Narrows Bridge in Washington, USA. One of the main reasons (not the only reason - the other being aeroelastic flutter) for its collapse is the effect