It smelled of motor oil and friction heat, the way a nineteen-forties Spitfire might.

NEWYORKER: Hand on the Shoulder

Leadership sits at the very center of friction and heat and chaos and delivers guidance, counsel, direction, encouragement, focus.

FORBES: An Innovation Leadership Revolution Is Brewing

The heat from the friction of its descent into the denser air can ignite the dust and debris in a display of astronomical fireworks.

WSJ: Meteor Creates a Show, No Apparent Damage

They often have interesting properties, such as poor heat conductivity (which makes them good insulators) and low friction (which makes them slippery).

ECONOMIST: The 2011 Nobel prizes

The brakes also serve to send energy to the batteries, recapturing energy from friction and regenerating electricity, rather than allowing the energy to dissipate as heat.

FORBES: 2013 Ford Fusion Energi Test Drive And Review: Plug It In And Go