Question

1) Boundary lubrication:

a) Occurs if two surfaces are completely separated bylubricant

b) Occurs at low loads and high sliding speeds

c) Is a result of bone fracture

d) Lowers friction and reduces wear to zero

e) Lowers friction and reduces wear without entirely eliminatingit

2) Hydrodynamic lubrication:

a) Results in complete separation of the two sliding surfaces bya film of lubricant

b) Occurs at high loads and low sliding speeds

c) Is desirable because it causes turbulence

d) Is the lubrication mechanism in total hip prosthesis

e) Can only occur if the surfaces are very smooth