Last week, Stanford researchers revealed that that they had built tiny drones that can open doors. I'm not sure I'm happy about this: How will we keep the robots out of our houses if they can just ...

Maximum acceleration when pulling a block with friction. This video explains how friction limits acceleration, how to apply Newton’s laws correctly, and how to determine the maximum possible ...

The kids learn about pulleys. / Sally learns about a force called friction. The kids want to get a trunk up into the treehouse and go to the Machine-a-Ma-Zoo, where they’re introduced to simple ...

Forgive me for all the posts on ESPN's Sport Science (example: Pulling and Power). I can't help myself. In the short episode recently, Sport Science compared a football player pulling a sled with huge ...

(Phys.org)—Many people are familiar with the friction enigma of two interleaved phonebooks, in which all of the pages of two phonebooks are overlapped, one by one, with the books' spines facing ...

A famous demonstration of the counterintuitive power of friction involves two telephone directories with their pages alternately interleaved. People are then invited to pull the directories apart, a ...