Frictional (adjective)

1. Relating to friction or the force that opposes motion when two surfaces are in contact.
2. Relating to the resistance to motion caused by friction.

Origin:

Late 18th century; earliest use found in encyclopædia britannica. from frictional + -al.

Examples:

1. The car's wheels had poor frictional grip on the road.
2. The frictional force between the two surfaces prevented the door from opening.
3. The frictional energy of the system was converted into heat.
4. Frictional heating causes the brake pads to wear down.
5. Frictional unemployment is caused by the time it takes for workers to find new jobs.