A car parks on a steep hill. It stays exactly where it stopped, hour after hour.
Something keeps it from sliding downhill. And it keeps doing so while nothing moves at all.
Friction can act between two touching surfaces even when they are not sliding across each other. That friction has its own name.
Here is the parked car. Its tires touch the road, and the two surfaces are not sliding across each other.
A friction force from the road acts on the tires, against the attempted slide downhill. Without it, the car would slide.
When touching surfaces are not sliding across each other, the friction that prevents the slide is called static friction.
Static friction holds a parked car in place on a hill.
A second case: a ladder's feet rest on a floor. The feet do not slide away from the wall, because static friction from the floor acts on them.
A third case: Beth applies a horizontal force to a filing cabinet, and it does not slide. Static friction from the floor acts on the cabinet, against the attempted slide.
The test is the same in every case: the surfaces touch, no sliding has started, and friction prevents the slide. That friction is static friction.
Which situation shows static friction acting?
Imre says: 'A friction force can act on a crate even while the crate is perfectly still.' Is he correct?
A trash bin stands on a sloped driveway without sliding. Name the force that prevents the slide, and the two surfaces it acts between.
The bin's base and the driveway touch, and they are not sliding across each other.
The friction that prevents a slide between non-sliding surfaces is static friction.
Static friction, acting between the bin's base and the driveway.
Rowan applies a force to a heavy dresser, and it does not slide. What kind of friction acts on the dresser?
The dresser's feet and the floor touch, and no sliding has started.
The friction preventing the attempted slide is static friction.
Static friction, from the floor on the dresser.
When touching surfaces are not sliding across each other, the friction that prevents the slide gets a name. Type the name.
When is the friction between two touching surfaces called static friction?
In which case does static friction act?
Which statement about static friction is correct?