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Red Supergiant Star

A star of 15 solar masses exhausts its hydrogen in about one-thousandth the lifetime of our sun.

http://hyperphysics.phy-astr.gsu.edu/hbase/astro/redsup.html#c1

Red Giant

For stars of less than 4 solar masses, hydrogen burn-up at the center triggers expansion to the red giant phase.

http://hyperphysics.phy-astr.gsu.edu/hbase/astro/redgia.html#c1

Collision

This site demonstrates two-dimensional collisions. Two balls of different masses can be shot at each other and the resulting collision and direction of the balls is shown

http://galileo.phys.virginia.edu/classes/109N/more_stuff/Applets/Collision/jarapplet.html

Atwood's Machine

The Atwood machine consists of two masses (M1 and M1) connected via a rope running over a pulley. This site considers the frictionless case.

http://hyperphysics.phy-astr.gsu.edu/hbase/atwd.html#c1

Falling Parachutes and Air Resistance 2

A simulation of two masses (may be altered) falling under the influence of gravity while attached to different sized parachutes.

http://physics.weber.edu/amiri/Director/DCRfiles/airResistance/ChuteOneS.dcr

Neutron degeneracy is a stellar application of the Pauli Exclusion Principle, as is electron degeneracy. No two neutrons can occupy identical states, even under the pressure of a collapsing star of ...