Final answer:
The types of friction from least to greatest are rolling, kinetic, and static, which matches with option c. Static friction, which acts on objects at rest, is generally greater than kinetic friction for objects in motion, and both are greater than rolling friction.
Step-by-step explanation:
To answer the question about the order of types of friction from least to greatest, it's necessary to understand the characteristics of each type of friction. Kinetic friction acts on objects in motion, static friction acts on objects at rest, and rolling friction is a type of friction that occurs when an object rolls over a surface.
Static friction is typically the strongest type of friction because it must be overcome to start the movement of stationary objects. Once an object is in motion, kinetic friction takes over, and it is usually less than static friction as it does not have to overcome the initial interlocking of surface irregularities. Rolling friction is generally the least because it involves a rolling motion that has less contact area and therefore less friction.
Answering the given multiple-choice question, the types of friction in order from least to greatest are: Rolling, kinetic, static. This matches with option c.
The answer to the varieties of friction and what they act upon is b. Kinetic friction acts on an object in motion, whereas static friction acts on an object at rest. This helps us calculate the magnitude of static and kinetic friction using their respective coefficients which depend on the materials in contact.