Energy and Its Conservation
Practice Test
1.
The equation that represents gravitational potential energy is __________.
a.
PE
g
=
E
+
KE
b.
PE
g
=
Fd
c.
PE
g
= 1/2
mv
2
d.
PE
g
=
mgh
Hint
2.
The law of conservation of energy states that __________.
a.
the total amount of energy in any system is the sum of its kinetic and gravitational potential energies
b.
if a system is isolated from external forces, then the total amount of energy is constant
c.
the total amount of energy in any system is its mechanical energy
d.
in a closed, isolated system, the total amount of energy is constant
Hint
3.
If the mass of the ball rolling down the ramp in Figure 11-10 were doubled, how would its speed at the bottom of the ramp be affected?
a.
It would be doubled.
b.
It wouldn't change.
c.
It would be halved.
d.
It would be quadrupled.
Hint
4.
The __________ is the position at which gravitational potential energy is zero.
a.
height
b.
reference level
c.
release point
d.
initial position
Hint
