1Q10.30-Rolling Ring, Disc, and Sphere | ![1q1030_rolling_ring_disc_sphere_2](https://websites.umass.edu/plecprep/files/2015/07/1q1030_rolling_ring_disc_sphere_2-300x225.jpg) | This demonstration shows the conservation of mechanical energy. It also shows objects with ... |
1Q40.10-Rotating Platform and Weights | ![1q4010_rotating_platform_and_weights](https://websites.umass.edu/plecprep/files/2015/07/1q4010_rotating_platform_and_weights-300x225.jpg) | This demonstration illustrates the principle of conservation of angular momentum (Ice skater effect). |
1Q40.23-Centrifugal Governor | ![1q4023_centrifugal_governor](https://websites.umass.edu/plecprep/files/2015/07/1q4023_centrifugal_governor-300x225.jpg) | This demonstration illustrates the apparent centrigual force. Can be used to describe the ... |
1Q40.30-Rotating Platform and Bicycle Wheel | ![1q4030_rotating_platform_and_bicycle_wheel](https://websites.umass.edu/plecprep/files/2015/07/1q4030_rotating_platform_and_bicycle_wheel-300x225.jpg) | This demonstration shows the conservation of angular momentum. The only angular momentum of ... |