Energy
Practice Test
1.
How much gravitational potential energy does a 75-kg diver have stepping off the edge of a 5-m platform?
a.
375 J
b.
15 J
c.
147 J
d.
3,675 J
Hint
2.
How much kinetic energy does a moving object have if its mass is 100 kg and it is moving at a speed of 5 meters per second?
a.
2,500 J
b.
250 J
c.
1,250 J
d.
125,000 J
Hint
3.
A baseball is hit into the air with a bat. When does the baseball have the greatest gravitational potential energy?
a.
when it reaches its highest point
b.
when it leaves the bat
c.
when it hits the ground
d.
when the mechanical and kinetic energies of the baseball are equal
Hint
4.
__________ is energy stored by things that stretch or compress.
a.
Elastic kinetic energy
b.
Gravitational potential
c.
Elastic potential energy
d.
Chemical kinetic energy
Hint
5.
The total amount of potential and kinetic energy in a system is called __________.
a.
mechanical energy
b.
thermal energy
c.
complete energy
d.
energy maximum
Hint
6.
The law of conservation of energy states that __________.
a.
energy is not created or destroyed and its form is constant
b.
when energy is transformed, the total energy of a system is less than it was before the change
c.
energy cannot be created or destroyed
d.
energy can be created and destroyed but cannot change form
Hint
7.
__________ is the energy stored in an object due to its position.
a.
Entropy
b.
Potential energy
c.
Thermal energy
d.
Kinetic energy
Hint
8.
The __________ is the SI unit of energy.
a.
ampere
b.
watt
c.
joule
d.
volt
Hint
9.
By what process does the Sun produce enough energy to warm Earth?
a.
catabolism
b.
nuclear fusion
c.
glycolysis
d.
transformation of thermal energy into kinetic energy
Hint
10.
Which of the following is NOT a form of energy?
a.
friction
b.
electrical
c.
thermal
d.
chemical
Hint
11.
As energy transformations occur within a system, the total energy of the system __________.
a.
increases
b.
is transferred out of the system
c.
remains constant
d.
decreases
Hint
12.
What two factors determine how much potential energy an object has?
a.
speed and mass
b.
speed and surface area
c.
mass and position
d.
speed and position
Hint
13.
What two factors determine how much gravitational potential energy is in an object?
a.
weight and speed of the object
b.
shape of the object and its position relative to the ground
c.
weight of the object and height above the ground
d.
shape and speed of the object
Hint
14.
Without changing the mass of a moving object, doubling its velocity will __________ its kinetic energy.
a.
quadruple
b.
not affect
c.
triple
d.
double
Hint
15.
What two factors determine how much kinetic energy an object has?
a.
position and mass
b.
speed and surface area
c.
speed and mass
d.
speed and position
Hint
16.
Which of the following objects has kinetic energy?
a.
a bicycle parked at the top of a hill
b.
a ball rolling across the floor
c.
a sunny windowsill
d.
leaves lying on the ground beneath a tree
Hint
17.
Which of the following vehicles has the most kinetic energy?
a.
a 300-kg motorcycle traveling 100 km/h
b.
a 2000-kg truck traveling 50 km/h
c.
a 900-kg car traveling 80 km/h
d.
a 1,100-kg car traveling 60 km/h
Hint
18.
Carbohydrates and proteins each supply about __________ Calories of energy per gram.
a.
4
b.
400
c.
14
d.
40
Hint
19.
Energy stored in chemical bonds is __________.
a.
thermal potential energy
b.
energy of activation
c.
chemical potential energy
d.
chemical kinetic energy
Hint
20.
Which of the following statements about an apple falling from a tree is true?
a.
Its potential energy decreases and its kinetic energy increases.
b.
Its mechanical energy increases.
c.
Its kinetic and potential energies remain constant.
d.
Its kinetic energy decreases and its potential energy increases.
Hint
