FRICTION 181
to maintain a constant speed of sliding
is:
(a) 100.4 N (b) 40 N
(c) 99.6 N (d) 250 N
- The normal force between two surfaces
is 50 N and the force required to main-
tain a constant speed of sliding is 25 N.
The dynamic coefficient of friction is:
(a) 25 (b) 2 (c) 75 (d) 0.5
- The maximum force, which can be
applied to an object without sliding
occurring, is 60 N, and the static coeffi-
cient of friction is 0.3. The normal force
between the two surfaces is:
(a) 200 N (b) 18 N
(c) 60.3 N (d) 59.7 N
- The formula for the angle of repose is:
(a)F=μN (b) tanθ=μ
(c)μ=
F
N
(d) tanθ=
sinθ
cosθ
