Imagine a heavy book resting on a table. If you try to gently push the book across the table with the tip of your finger, it ...

If you've ever greeted someone or touched metal and felt a shock, it means there's too much energy built up. Experts explain ...

Imagine a heavy book resting on a table. If you try to gently push the book across the table with the tip of your finger, it may first appear to ...

Perhaps few physical concepts have received less attention relative to their importance than friction. Learning the 'effective' notions of static and sliding friction, students of mechanics can ...

However, if you try to slide the mug across the table then a friction force will come into play and initially resist your push until your pushing force exceeds the frictional force. In other words, in ...

the dielectric plate is first rubbed with a cloth to create a static charge through friction. This is another example of the triboelectric effect, as also used in the Van de Graaff generator.

NARRATOR: There’s less friction between the snow and the skis than there was between the road and the skis because snow is a smoother surface? And the less friction there is the easier two ...