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Conservation Of Energy
Test Description: The Law of Conservation of Energy and the properties of energy and work.
Instructions: Answer all questions to get your test result.
1) When driving a car, the chemical energy in gasoline is converted to heat (thermal energy) in the engine. Most of this thermal energy is then converted to mechanical energy, which makes the car move. What happens to the rest of the thermal energy?
A
It is given off by the hot engine.
B
It is destroyed by the engine
C
It is converted for the rest of the trip.
D
It changes back to chemical energy.
2) According to the Law of Conservation of Energy, the total amount of energy in the universe ______________.
A
remains constant
B
decreases
C
increases
D
changes constantly
3) Which is an example of mechanical energy?
A
green plants making their own food
B
the fire from the burner on the stove
C
the flow of energy from a hot pan to your hand
D
pushing a box across the floor
4) Bob has an electric motor and a generator. Which pairs of energy terms are the most closely related to the development of a motor and a generator?
A
electricity and magnetism
B
light and magnetism
C
sound and light
D
electricity and sound
5) Moving a wire through a magnetic field _____________.
A
creates an electrical current in the wire
B
has no effect on the wire
C
changes electrical energy into mechanical energy
D
reduces the strength of the magnetic field
6) What type of energy transfer occurs when the heat in the sand transfers to the person's feet?
A
radiation
B
kinetic
C
conduction
D
convection
7) _________ happens when a force causes an object to move in the same direction that the force is applied.
A
Energy
B
Work
C
Power
D
Heat
8) Which statement describes the flow of heat?
A
Heat moves only between two warm objects.
B
Heat moves from a cooler object to a warmer object.
C
Heat moves only between two cold objects.
D
Heat moves from a warmer object to a cooler object.
9) How does a pulley reduce the effort required to move a heavy object?
A
It changes the direction of the input force.
B
It moves back and forth on a fulcrum.
C
It reduces the friction between an object and the surface it is being pulled across
D
It moves an object over a greater distance rather than straight up.
10) A simple machine makes work easier by _____________.
A
pushing objects apart
B
moving objects to a higher level
C
reducing the force needed to move an object
D
increasing the effort needed to move an object
11) When you use a hammer to pull a nail from a piece of wood, which simple machine are you using?
A
wheel and axle
B
inclined plane
C
lever
D
pulley
12) How could a box be moved up a ramp with the LEAST amount of effort?
A
pushing a box up a ramp with wheels under the box
B
pushing a box up a ramp with sandpaper on the surface of the ramp
C
pulling a box up a ramp
D
pushing a box up a ramp
13) During _______________, energy is transferred through electromagnetic waves that travel through space until they are absorbed
A
expansion
B
convection
C
radiation
D
conduction
14) Which of the choices below are known as six simple machines?
A
rope, lever, pulley, wheel and axle, screw, inclined plane, wedge
B
pulley, inclined plane, lever, wedge, screw, wheel and axle
C
wooden plank, rope, screw, inclined plane, wedge, pulley
D
screw, lever, pulley, inclined plane, rope, chain
15) Convection is the transfer of energy by the motion of heated particles in a fluid. which statement BEST describes an example of convection?
A
a shirt heated by an iron
B
a dark-colored car heated by sunlight
C
warm air rising in the atmosphere
D
a puddle of rainwater heated by sunlight
16) Two men are standing on either side of a box pushing against each other. They each push for 30 seconds but do not move the box. The men applied _____________ but no _____________ was done.
A
pull, work
B
force, work
C
force, energy
D
work, force
17) Terry used a ramp to load boxes on a truck. For the work he had to do, the ramp decreased __________.
A
the height he had to travel
B
the distance he had to travel
C
the time it took to load the boxes
D
the force he had to apply
18) Which is an example of a simple machine?
A
baseball bat
B
hat
C
rope
D
can opener
19) The difference between a simple machine and a complex machine is __________
A
a simple machine has one machine and a complex machine has two or more machines
B
there is no difference
C
a simple machine has two machines and a complex machine has three machines
D
a simple machine has two or more machines and a complex machine has only one machine
20) A toy helicopter blades spin when its circuit is connected to a battery. Which sequence shows the energy changes taking place in the helicopter?
A
chemical to electrical to potential
B
electrical to mechanical to potential
C
heat to mechanical to sound
D
chemical to electrical to kinetic
*select an answer for all questions
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