Newton's Third Law is often quoted as "For every action there is an equal and opposite reaction." As N3wton's title suggests, the Third Law is at the heart of this little physics-oriented computer game. Click to play. (Warning: there's music.)

When playing golf in outer space, it's important to keep in mind Newton's Universal Law of Gravitation:

F = Gm₁m₂ / r²

This equation describes the force of gravity between any two masses separated by a distance r between their centers. G is a constant of nature that we call the universal gravitational constant.

See it in action in this week's online game, Gravitee.

[Via Diggy Games]

Welcome to Magic Pen. This fascinating little game displays a delightful plethora of physics principles in action. The object of Magic Pen -- as in some similar games, like Crayon Physics Deluxe -- is to roll a ball into a goal. The catch is that you can't touch the ball directly: you can only interact with it by drawing shapes with the mouse. These shapes then interact with the ball, obeying basic principles of physics. For example, draw a rock. The rock then falls due to gravity, collides with the ball, and pushes it towards the goal, which is marked by a flag.