Save guides, add subjects and pick up where you left off with your BBC account. This is the maximum velocity it can reach when all the forces are balanced. The size and direction of the resultant ...

Our motion perception is remarkably well tuned to detect small changes in speed and direction. For example, soccer goalkeepers need to precisely judge the speed, direction, and curvature of an ...

Light has fascinated scientists for centuries. Galileo Galilei was the first to consider measuring its speed. In 1676, astronomer Ole Roemer made observations of the eclipses of Jupiter's moons to ...

The hows and whys of rainfall have been pondered for about as long as human beings have walked upright. Now a research team thinks it has discovered something everyone else missed: Some raindrops fall ...

Falling objects injured three different people in three separate incidents I recently investigated. The common thread: unsecured objects above the victims’ heads. As in any falling-object case, most ...