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