Hooke's Law, elasticity: http://webphysics.davidson.edu/Applets/animator4/demo_hook.html


Pendulum vectors: http://www.walter-fendt.de/ph14e/pendulum.htm


Pendulum 2: http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=11


Mass on  spring: http://www.walter-fendt.de/ph14e/springpendulum.htm


Mass on spring2: http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=148


mass on spring energy levels: http://phet.colorado.edu/en/simulation/mass-spring-lab

 

Longitudinal/transverse animation: http://paws.kettering.edu/~drussell/Demos/waves/wavemotion.html


Standing waves/beats (animation): http://paws.kettering.edu/~drussell/Demos/superposition/superposition.html


Reflection boundary conditions (animation): http://paws.kettering.edu/~drussell/Demos/reflect/reflect.html


standing waves: http://www.walter-fendt.de/ph14e/stwaverefl.htm


longitudinal standing wave: http://www.walter-fendt.de/ph14e/stlwaves.htm


spring driver resonance: http://www.walter-fendt.de/ph14e/resonance.htm

 

The virtual Ripple tank : http://www.falstad.com/ripple/


Phet Fourier: http://phet.colorado.edu/en/simulation/fourier

 

Fourier Synthesizer: http://www.falstad.com/fourier/


string harmonics: http://www.falstad.com/loadedstring/


Vowel synthesizer: http://www.falstad.com/vowel/


Sound source interference: http://www.falstad.com/interference/


Refraction of sound waves (animation): http://paws.kettering.edu/~drussell/Demos/refract/refract.html


Doppler/shock wave animation (with links to F-14 pix):

http://paws.kettering.edu/~drussell/Demos/doppler/doppler.html