Algodoo
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Link: http://www.algodoo.com/
Algodoo is an app for the iPad, Macs, and PCs that gives you the opportunity to play with physics. Use your own hands and simple drawing tools to design, construct, and explore the world of physics. It is now free for desktop computers!
With Algodoo you can create simulation scenes using simple drawing tools like boxes, circles, polygons, gears, brushes, plans, ropes, and chains. Easily interact with your objects by click and drag, tilt and shake. Edit and make changes by rotating, scaling, moving, cutting, or cloning your objects.
You can also add more physics in your simulation like fluids, springs, hinges, motors, thrusters, light rays, tracers, optics, and lenses. Algodoo also allows you to explore and play around with different parameters like gravity, friction, restitution, refraction, attraction, etc.
Video: Algodoo Webinar - Float and sink Video: Algodoo Webinar - Axels & Motors Video: Algodoo Webinar - Combine shapes with CSG
Video: Algodoo Webinar - Sketch tool & Gestures Video: Algodoo Webinar - Air, forces & plots Video: Algodoo Webinar - Springs & Damping
Video: Algodoo Webinar - Conservation of energy, Video: Algodoo Webinar - Double Pendulum & Chaos Video: Algodoo Webinar - Optics and lenses
pendulum example Theory