In this video David quickly explains each concept for waves and simple harmonic motion and does an example question for each one. Created by David SantoPietro.
David defines the terms amplitude and period for simple harmonic motion and shows how to find them on a graph. Created by David SantoPietro.
Sal graphs elastic potential energy and kinetic energy for a mass on a spring and compares the total energy when with and without dissipative forces (friction).
David explains the equation that represents the motion of a simple harmonic oscillator and solves an example problem. Created by David SantoPietro.
David defines what it means for something to be a simple harmonic oscillator and gives some intuition about why oscillators do what they do as well as where the speed, acceleration, and force will be largest and smallest. Created by David SantoPietro.
This collection is the first of five dealing with the rudiments of music.
David explains how a pendulum can be treated as a simple harmonic oscillator, and then explains what affects, as well as what does not affect, the period of a pendulum. Created by David SantoPietro.
Fundamental frequencies (first harmonics) of strings.
Lab worksheet with the purpose of calculating the speed of sound in the classroom. To be used after introduction to standing waves and harmonics in a pipe that is closed at one end.
Lab worksheet with the purpose of calculating the speed of sound in the classroom. To be used after introduction to standing waves and harmonics in a pipe that is closed at one end.
Watch a string vibrate in slow motion. Wiggle the end of the string and make waves, or adjust the frequency and amplitude of an oscillator. Adjust the damping and tension. The end can be fixed, loose, or open.
This resource is a video abstract of a research paper created by Research Square on behalf of its authors. It provides a synopsis that's easy to understand, and can be used to introduce the topics it covers to students, researchers, and the general public. The video's transcript is also provided in full, with a portion provided below for preview:
"The fidelity of cellular signaling is largely dependent upon “hubs” of protein-protein interaction that integrate signals across large intersecting signaling webs. Hub proteins tend to have a high degree of intrinsic disorder, which allows them to interact with an array of differently structured proteins. However, in some cases the hub is structured and interacts with disordered ligands instead. One example is a recently described group of folded hubs, the αα-hubs, which are connected by a shared structural foundation. The αα-hubs are small α-helical domains found in large modular proteins that interact with disordered ligands such as transcription factors. A recent commentary suggests that the harmonin-homology-domain (HHD) belongs to the αα-hub group based on structural analysis. The inclusion of HHD adds several functions to the group, such as telomere regulation and neurovascular integrity..."
The rest of the transcript, along with a link to the research itself, is available on the resource itself.