CoM: 1-D and 2-D: PHET animation (use "advanced" tab for 2-D collisions)
2-D impulse vector diagrams (interactive vector subtraction)
2-D vector addition (total momentum) or subtraction (impulse): Geogebra
2-D vector addition, subtraction and net-zero: PHET in "equations" section
Conical Pendulum: One animation ... or this one (both from GeoGebra)
Conical Pendulum with forces HKNG (must download and run the java file)
Vertical Circle (roller-coaster) Surandraneth
Various Earth-Sun orbit simulation (Boston Uni)
what is a radian? (animated gif)
Torque, angular velocity, angular acceleration, rotational inertia and angular momentum: PHET turntable with bugs!
Rotational Kinetic Energy of tic-tacs: youtube from PhysicsGirl
different masses racing down ramp (mass distribution idea) GeoGebra
different masses rolling down ramp (showing calculation of Ekr and Ek) GeoGebra
angular acceleration from torque: GeoGebra
Person on rotating platform: GeoGebra
Graphing circular motion displacement (animated gif)
Pendulum with disp, vel and acc phasor (Gilmour)
Displacement Phasor, wave and motion of mass or pendulum (Geogebra) GOOD!!!
reference circle concept vert and hoirz (Surendranath: use dropdown menu: oscillations: SHM)
Interactive reference circles (with sine vs cosine wave)
mass on spring (HKNG) with ref-circle & y, v, a vs t graphs
Ref-circle with mass on spring AND graph of y vs t (Surendranath: use dropdown menu: oscillations: phase-graph)
How kinetic and potential energy change with location or time (Surendranath: use dropdown menu: oscillations: mass-spring oscillations: then either K,U vs x or K,U vs t)