This episode is sponsored by Audible. Try Audible: http://audible.com/crashcourse Why is it hard to move a heavy bookcase across a carpeted floor? And why is ...
========== This episode of Crash Course Physics
is sponsored by Audible. If you watched our episode on Newton’s laws
of motion, then you’re practically an expert on FORCES,
and the way they make things accelerate. But there’s something we left out --
something important when you’re trying to describe how things move in real life:
FRICTION. It stops a baseball player sliding into home plate. And it’s the reason I can pick up this cup without it slipping through my fingers. Without friction, it would be tough to do
… almost anything. But it also makes doing OTHER things…pretty
hard. Anyone who has moved furniture knows that. Luckily, friction is also a force, so, as
physicists, we know what to do with it. [Theme Music] You’re moving into a new house, and you ask a friend to come hel...