Beats
http://www.thephysicsaviary.com/Physics/Programs/Labs/Beats/index.html
Change k, m, A, g, see x /t graph
http://www.thephysicsaviary.com/Physics/Programs/Labs/OscillationLab/index.html
Pendulum waves in 2D
Doppler Effect
Change variables, see x/v/a, and KE/PE graphs
Helen rates this resource as good
Change l, m, g, See x, v, a, E/t
Doppler Effect
See x/v/a graphs for horizontal spring system
Use mass on ramp to change angle and measure T of pendulum
https://app.pivotinteractives.com/activities/5b5a230172e8d5002a76729f/preview
Helen rates this resource as good
Drag mass to stor energy, see bar charts/graphs of damped motion
http://mw.concord.org/nextgen/#interactives/physics/energy-conservation/energy-spring