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Physics 160 - Chapter 5 Multiplechoice practise problems
1. The moment arm is defined as
a. the distance from the point of application of a force to a
specified axis of rotation
b. the distance from the line of action of a force to a specified
axis of rotation
c. the perpendicular distance from the line of action of a force
to a specified axis of rotation
d. all of the above
e. none of the above
2. Torque is defined as
a.
b.
c.
d.
e.
the tendency of a force to cause rotation
the turning effect of a force
the product of force and moment arm
all of the above
none of the above
3. The moment arm of the biceps brachii muscle about the elbow joint is
largest when the angle at the elbow joint is approximately
a. 180° (fully extended)
b. 150°
c. 120°
d. 90°
e. The angle of the elbow joint doesn't affect the moment arm of
the biceps brachii muscle.
4. A weightlifter is attempting a biceps curl with a 200 N barbell. The
moment arm of the barbell about the elbow joint is 40 cm. What torque
is created by the barbell about the elbow joint?
5. What is the torque if a 50 N force is applied 2 m from the axis of
rotation?
a.
b.
c.
d.
e.
200 Nm
100 Nm
50 Nm
25 Nm
10 Nm
6. If the moment arm is 5 cm, and the force is 100 N, the magnitude of
the torque will be
a.
b.
c.
d.
e.
5 Nm
50 Nm
500 Nm
5000 Nm
need more information to calculate
7. In the average female, the center of gravity is located
a.
b.
c.
d.
e.
higher than in the average male
near the sternum
in the same place as the average male
near the acetabulum
lower than in the average male
8. The center of gravity of an object of uniform density is located
a.
b.
c.
d.
e.
at the edge of the object
slightly off center
at the exact center of the object
outside of the object
off center, at the edge of the object
9. Stability may be increased by
a. raising the center of mass
b. decreasing the number of contact points in the base of support
c. widening the base of support perpendicular to any oncoming
force
d. leaning away from an oncoming force
e. none of the above
10. For a body to be in static equilibrium,
a.
b.
c.
d.
e.
all forces acting on the body must sum to zero
all torques acting on the body must sum to zero
the body must be stationary
all of the above
none of the above
Physics 160 1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
c.
d.
d.
80 Nm
b.
a.
e.
c.
e.
d.
Answers