Make beats
http://www.physicsclassroom.com/Physics-Interactives/Waves-and-Sound/Beats
Change mass, k, see energy bar charts
http://www.physicsclassroom.com/Physics-Interactives/Work-and-Energy/Mass-on-a-Spring
SHM of block on loudspeaker
https://app.pivotinteractives.com/activities/5a57c1ce8c7e160020eed66c/preview
Helen rates this resource as good
Hang masses on 3 springs, change k, m, planet, damping, see bar charts
https://phet.colorado.edu/sims/mass-spring-lab/mass-spring-lab_en.html
Helen rates this resource as good
Change length, see graphs of x, v, a
Doppler Effect
Change g, m, l, theta, dampting, see graphs of x, v, a, energy, difference between small angle approx.
http://physics.bu.edu/~duffy/HTML5/simple_pendulum_damped.html
Helen rates this resource as good
Oscillation graphs quiz
Helen rates this resource as good