A student walks downstairs to class. Which statement correctly describes the types of energy the student has at the top of the stairs and as she walks down the stairs?
a
kinetic energy at the top of the stairs; potential energy as she walks down
b
kinetic energy at the top of the stairs; kinetic energy as she walks down
c
potential energy at the top of the stairs; kinetic energy as she walks down
d
potential energy at the top of the stairs; potential energy as she walks down
c
potential energy at the top of the stairs; kinetic energy as she walks down
When energy is conserved or transferred, some energy becomes unavailable to do useful work. What happened to the unavailable energy?
a
It is given off as heat.
b
It is conducted.
c
It is given off as microwaves.
d
It is completely destroyed.
a
It is given off as heat.
Two samples of water are prepared, one with red food coloring and one with blue. When carefully combined, the red-colored water is able to float on top of the blue-colored water. Which statement best explains this result?
a
The red-colored water is cooler and more dense.
b
The red-colored water is hotter and less dense.
c
The blue-colored water is cooler and less dense.
d
The blue-colored water is hotter and more dense.
c
The blue-colored water is cooler and less dense.
Betsy depends on her electric alarm clock every morning to get up in time for school. What energy transformation happens in Betsy's alarm clock to wake her up in the morning?
a
sound energy is converted to electrical energy
b
chemical energy is converted to kinetic energy
c
electrical energy is converted to thermal energy
d
electrical energy is converted to sound energy
d
electrical energy is converted to sound energy
Convection ovens are ovens that are advertised to cook food more evenly than a standard thermal oven. Which statement best explains how a convection oven works?
a
Hot air is transferred through heat being radiated from a thermal burner.
b
Hot air is transferred through density differences with cool air rising and hot air sinking.
c
Hot air is transferred through density differences with hot air rising and cool air sinking.
d
Hot air is transferred through molecule to molecule contact.
c
Hot air is transferred through density differences with hot air rising and cool air sinking.
Rita climbs a ladder to the top of a water slide, waits her turn, and then slides down the slide into a pool. Which series describes the energy changes of her actions?
a
potential → kinetic → potential
b
kinetic → mechanical → potential
c
potential → mechanical → kinetic
d
kinetic → potential → kinetic
c
potential → mechanical → kinetic
When a pole vaulter reaches the top of her vault, how does her potential energy compare to her kinetic energy?
a
The kinetic energy is twice the amount of potential energy.
b
The kinetic energy and potential energy are the same.
c
The kinetic energy is less than the potential energy.
d
The kinetic energy is greater than the potential energy.
c
The kinetic energy is less than the potential energy.
When an object is in motion, it possesses what type of energy?
a
potential energy
b
thermal energy
c
chemical energy
d
kinetic energy
d
kinetic energy
When handling a metal pan that has been heated on a stove, an oven mitt should always be used to avoid receiving burns. Which of the following is a physical property of the metal pan that requires the use of an oven mitt when it is hot?
a
high thermal conductivity
b
low thermal convection
c
low magnetism
d
high solubility
a
high thermal conductivity
A student wants to show the transfer of heat energy without matter. Which investigation design would best help the student?
a
an investigation of radiation through a current in a fluid
b
an investigation of radiation through electromagnetic waves
c
an investigation of conduction through the movement of particles through a solid
d
an investigation of conduction through collisions between particles in space
b
an investigation of radiation through electromagnetic waves
A science class goes to an amusement park to investigate potential and kinetic energy. Which action best demonstrates potential energy being transformed into kinetic energy?
Responses
a bungee jumper is released at the top of a tall tower and starts to fall
a bungee jumper is released at the top of a tall tower and starts to fall
a roller coaster slowly climbs the tall hill at the beginning of the ride
a roller coaster slowly climbs the tall hill at the beginning of the ride
a fireworks rocket shoots upward into the night sky above the park
a fireworks rocket shoots upward into the night sky above the park
a moving bumper car slams into another bumper car that is sitting still
b
a roller coaster slowly climbs the tall hill at the beginning of the ride