Home › AP Physics C: Mechanics › Physics › Friction, Drag, and Elasticity › Two surfaces are in contact and sliding past one…
Two surfaces are in contact and sliding past one another right now. What is the friction between them called?
AStatic friction
BKinetic friction
CRolling friction
DNormal friction
Answer & Solution
Correct answer: B. Kinetic friction
1. The source names friction between surfaces already sliding relative to each other.
2. When two surfaces are in contact and moving relative to one another, that friction is called kinetic friction.
3. Static friction instead applies when the surfaces are not yet moving relative to each other.
4. Rolling friction and normal friction are not the terms the source uses for this sliding case.
_Source: OpenStax College Physics (CC BY 4.0), Ch 5 "Further Applications of Newton's Laws: Friction, Drag, and Elasticity", section 5.1 Friction_
Related questions
According to the source, at roughly what point in life does the gradual physiological reduIf human arteries were rigid instead of elastic, what would you notice about your pulse, aA human tendon shows a nonlinear stress-strain curve. What does the source call the very fWhat example does the source give of a practical application of bulk compression on solidsUnlike most materials, what unusual behavior does water show when it freezes, according toAt a depth of 5.00 km in the ocean, the force per unit area on seawater is 5.00 times ten It is relatively easy to compress a gas but extremely difficult to compress a liquid or a What does the source say about the shear moduli of liquids and gases?