This causes friction with local people.

ECONOMIST: Afghanistan

"The resignation is bound to stir up renewed debate about friction within the Local Organising Committee (LOC), " said BBC Sport's Mohammed Allie in Cape Town.

BBC: Another 2010 official resigns

The accountability of US forces and local militia working with them has been a growing source of friction in Afghan-US relations.

BBC: File image of US soldier in Wardak province, Afghanistan

Ventures like World Coffee Research must also overcome friction with national research institutions that often aim to protect local interests, notably in Ethiopia, believed to be the fatherland of Arabica.

WSJ: The Indiana Jones of Coffee

By removing barriers and friction, always-on devices increase the incidence and frequency of local search, at home as well as on the go.

FORBES: Why Big Brands Are Going Local In 2013

The goal is to reduce friction with host nations, the kind that results from accidents and other problems relating to local sensitivities.

CENTERFORSECURITYPOLICY: Transforming the United States Global Defense Post