Energy Transfer Question Preview (ID: 59499)
7.P.2.
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Which of the following converts electrical energy into motion?
a) light switch
b) electric stove
c) light bulb
d) electric fan
When electric current flows through the metal filament of a light bulb, electrical energy is converted to which of the following:
a) heat energy only
b) heat and light energy
c) light and motion energy
d) light energy only
A toy car is placed at the top of a ramp and released. Which situation describes how the cars energy is transformed?
a) The car has a large amount of kinetic energy at the top of the ramp, which is converted into potential energy
b) The car has a large amount of kinetic energy at the top of the ramp, which is converted into chemical energy
c) The car has a large amount of potential energy at the top of the ramp, which is converted into kinetic energy
d) The car has a large amount of mechanical energy at the top of the ramp, which is converted into thermal energy
Which of the following is the best example of work being done on an object?
a) holding a 50kg barbell
b) lifting a bag of groceries
c) keeping a board in place
d) pushing on a car that will not move
The motor of one car is more powerful than the motor of another car. Which of the following must be true of the more powerful motor?
a) it can operate for a longer time
b) it can do work more quickly
c) it can burn fuel more efficiently
d) it can store more potential energy
Thomas watches an orange fall from a tree to the ground. Which best describes the flow of energy as the orange falls and hits the ground?
a) Solar energy → Potential energy → Heat energy
b) Potential energy → Sound energy → Heat energy
c) Kinetic energy → Potential energy → Sound energy
d) Potential energy → Kinetic energy → Sound energy
A roller coaster is climbing up the highest hill on its track. At which point will the front car of the coaster most likely have its greatest potential energy?
a) at the bottom of the highest hill
b) at the top of the highest hill
c) at the start of the track
d) at the end of the track
As the velocity of a runner increases, which type of energy also increases?
a) Kinetic
b) Potential
c) Chemical
d) Electrical
What does the mechanical energy of a system include?
a) the sum of the potential and kinetic energy
b) the difference of the potential and kinetic energy
c) only the kinetic energy
d) only the potential energy
A rock that falls off a cliff demonstrates both potential and kinetic energy. Which is the best comparison of these two forms of energy?
a) As the kinetic energy increases, the potential energy decreases.
b) As the potential energy decreases, the kinetic energy decreases.
c) The amount of kinetic energy is equal to one-half of the potential energy.
d) The amount of potential energy is equal to one-fourth of the kinetic energy.
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