Why is rolling friction smaller than sliding friction

answer:

rolling friction is considerably less than sliding friction as there is no work done against the body that is rolling by the force of friction. for a body to start rolling a small amount of friction is required at the point where it rests on the other surface, else it would slide instead of roll.

explanation:

i think it is non rem sleep

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2