Conservation Of Energy: Question Preview (ID: 19146)


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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) sound and light b) light and magnetism c) electricity and sound d) electricity and magnetism
Moving a wire through a magnetic field _____________.
a) has no effect on the wire b) creates an electrical current in the wire c) reduces the strength of the magnetic field d) changes electrical energy into mechanical energy
Which is an example of mechanical energy?
a) the fire from the burner on the stove b) pushing a box across the floor c) green plants making their own food d) the flow of energy from a hot pan to your hand
According to the Law of Conservation of Energy, the total amount of energy in the universe ______________.
a) changes constantly b) increases c) remains constant d) decreases
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 changes back to chemical energy. b) It is given off by the hot engine. c) It is converted for the rest of the trip. d) It is destroyed by the engine
What type of energy transfer occurs when the heat in the sand transfers to the person's feet?
a) conduction b) convection c) radiation d) kinetic
_________ happens when a force causes an object to move in the same direction that the force is applied.
a) Heat b) Power c) Energy d) Work
Which statement describes the flow of heat?
a) Heat moves from a warmer object to a cooler object. b) Heat moves from a cooler object to a warmer object. c) Heat moves only between two warm objects. d) Heat moves only between two cold objects.
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.
A simple machine makes work easier by _____________.
a) increasing the effort needed to move an object b) reducing the force needed to move an object c) pushing objects apart d) moving objects to a higher level
When you use a hammer to pull a nail from a piece of wood, which simple machine are you using?
a) pulley b) inclined plane c) lever d) wheel and axle
How could a box be moved up a ramp with the LEAST amount of effort?
a) pushing a box up a ramp b) pulling a box up a ramp c) pushing a box up a ramp with sandpaper on the surface of the ramp d) pushing a box up a ramp with wheels under the box
During _______________, energy is transferred through electromagnetic waves that travel through space until they are absorbed
a) conduction b) convection c) radiation d) expansion
Which of the choices below are known as six simple machines?
a) rope, lever, pulley, wheel and axle, screw, inclined plane, wedge b) wooden plank, rope, screw, inclined plane, wedge, pulley c) pulley, inclined plane, lever, wedge, screw, wheel and axle d) screw, lever, pulley, inclined plane, rope, chain
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 puddle of rainwater heated by sunlight c) a dark-colored car heated by sunlight d) warm air rising in the atmosphere
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) work, force b) force, energy c) pull, work d) force, work
Terry used a ramp to load boxes on a truck. For the work he had to do, the ramp decreased __________.
a) the time it took to load the boxes b) the force he had to apply c) the height he had to travel d) the distance he had to travel
Which is an example of a simple machine?
a) rope b) hat c) baseball bat d) can opener
The difference between a simple machine and a complex machine is __________
a) there is no difference b) a simple machine has two or more machines and a complex machine has only one machine c) a simple machine has one machine and a complex machine has two or more machines d) a simple machine has two machines and a complex machine has three machines
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) heat to mechanical to sound b) electrical to mechanical to potential c) chemical to electrical to kinetic d) chemical to electrical to potential
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