friction

To realize these movements in a natural system with friction, a computer-controlled regulator has now been added that delivers an impulse at the right moment.

The debris, which can be as fine as a grain of sand, burns up with the friction as it hits the Earth's atmosphere.

But more than a year into this regional conflict, friction is also being felt along its quietest frontier.

Lurie could face less friction than Breed did in getting the county’s powerful Board of Supervisors to support his agenda.

She faithfully supports her husband for years, even as he makes decisions that cause friction — including eventually having 11 children by seven women.