What are the conditions which lead to harmony or friction between groups of people? Here the question is approached by means of controlled situations in a boys' summer camp ...

So you've got the force called friction to thank for this.Hmm ... Mwaksy Mudenda and Greg Foot as they use demonstrations, experiments and animations to learn about forces and electricity.

Discover the fascinating world of static electricity through simple balloon experiments. You'll learn how static charges build up through friction, how they attract or repel objects, and see everyday ...