Section 8.3
Equilibrium
Practice Test
1.
An object is in __________ when the net torque exerted on it is zero.
a.
translational equilibrium
b.
static equilibrium
c.
rotational equilibrium
d.
equilibrium
Hint
2.
What happens to an object when its velocity and angular velocity are zero or constant?
a.
It accelerates.
b.
It's in translational equilibrium.
c.
It's in rotational equilbrium.
d.
It's in static equilibrium.
Hint
3.
An object is in __________ when the net force exerted on it is zero.
a.
rotational equilibrium
b.
equilibrium
c.
translational equilibrium
d.
static equilibrium
Hint
4.
Newton's laws are valid only __________.
a.
in vacuum
b.
on Earth
c.
in nonaccelerated or inertial frames
d.
in rotating frames
Hint
5.
The centripetal acceleration is given by:
a.
a
c
=
rω
2
b.
a
c
=
rω
c.
a
c
=
ω
2
/
r
d.
a
c
=
r
/
ω
Hint
6.
Which two conditions make an object the most stable?
a.
a high center of mass and a narrow base.
b.
a high center of mass and a large base.
c.
a high center of mass and a narrow base.
d.
a low center of mass and a large base.
Hint
7.
The __________ of an object is the point on the object that moves in the same way that a point particle would move.
a.
torque
b.
axis
c.
center of mass
d.
orbit
Hint
8.
What causes the Coriolis force?
a.
winds
b.
the rotation of Earth
c.
low pressure areas
d.
gravity
Hint
