Push on something and change its motion. Your action has had an effect in the world: something (the object ) changes its...

Physics Narrative 14-16

Newton's grand synthesis of the work of Kepler, Galileo and others who thought about the movements in the solar system was an...

Physics Narrative 14-16

Pairs of forces replace each interaction. The interaction diagram, introduced earlier in this episode, is a thorough way to...

Physics Narrative 14-16

A billiard ball rolls in, and strikes another identical stationary ball. What happens next? Many billiard players will know...

Physics Narrative 14-16

Pairs of objects interact, by collision or explosion.

Physics Narrative 14-16

If space and time are entangled, as suggested in the special theory of relativity, we'd expect there to be some differences...

Physics Narrative 14-16

The world of Newton is extremely simple, and therefore extremely powerful. We can be certain of what to expect, because there...

Physics Narrative 14-16