At fs,max objects . . . . . moving.
a) start
b) stop
c) both a and b
d) none of these
When
a body rolls over a surface, the force of friction is called . . . . . .
a) sliding friction
b) rolling friction
c) static friction
d) none
When a body slides over a surface, the friction is called . . . . . .
a) rolling friction
b) static friction
c) sliding friction
d) both b & c
Friction can be reduced by . . . . . .
a) polishing rough surfaces
b) applying lubricants
c) by using ball bearing
d) all above
Buckyballs were discovered in . . . . . .
a) 1985
b) 1986
c) 1987
d) 1983
Buckyballs consisting of . . . . . . carbon atoms.
a) 20
b) 50
c) 60
d) 61
