An object’s gravitational potential energy depends on the object’s mass, the strength of the gravitational field, and what other variable?(1 point)
Responses
the shape of the object
the shape of the object
the speed of the object
the speed of the object
the object's height from the ground
the object's height from the ground
the color of the object
the object's height from the ground
If you are at an amusement park and you ride a slingshot, how does your potential energy compare to your kinetic energy at the top of the shot?
(1 point)
Responses
The kinetic energy is twice the amount of potential energy.
The kinetic energy is twice the amount of potential energy.
The kinetic energy is less than potential energy.
The kinetic energy is less than potential energy.
The kinetic energy and potential energy are the same.
The kinetic energy and potential energy are the same.
Kinetic energy is greater than potential energy.
The kinetic energy is less than potential energy.
In an investigation of energy transfer, a student observes a roller coaster at locations A, B, C, and D. Then she creates the graph below of the roller coaster’s potential and kinetic energy at each location.
Which statement is true according to the graph?
(1 point)
Responses
The roller coaster destroys potential energy.
The roller coaster destroys potential energy.
The roller coaster’s kinetic and potential energy change from location to the next, but its total energy remains the same.
The roller coaster’s kinetic and potential energy change from location to the next, but its total energy remains the same.
Potential energy increases, but kinetic energy does not change.
Potential energy increases, but kinetic energy does not change.
The roller coaster creates kinetic energy.
The roller coaster’s kinetic and potential energy change from location to the next, but its total energy remains the same.
8. The pendulum in the diagram below swings from position A to B.
If we don’t consider friction, what happens to the total mechanical energy as the pendulum swings from position A to position B?
(1 point)
Responses
It declines
It declines
It becomes greater.
It becomes greater.
It is not conserved
It is not conserved
It remains the same
It remains the same
Rebecca climbs the ladder of a large water slide, waits her turn at the top, and then slides down the slide into a pool. Which answer best describes the energy changes during her time on the slide?(1 point)
Responses
kinetic → potential → kinetic
kinetic → potential → kinetic
potential → mechanical → kinetic
potential → mechanical → kinetic
kinetic → mechanical → potential
kinetic → mechanical → potential
potential → kinetic → potential
kinetic → potential → kinetic
Kim is upstairs, but walks downstairs to the kitchen for a snack. Which statement correctly describes the types of energy she has at the top of the stairs and as she walks down the stairs?(1 point)
Responses
potential energy at the top of the stairs; kinetic energy as she walks down
potential energy at the top of the stairs; kinetic energy as she walks down
potential energy at the top of the stairs; potential energy as she walks down
potential energy at the top of the stairs; potential energy as she walks down
kinetic energy at the top of the stairs; potential energy as she walks down
kinetic energy at the top of the stairs; potential energy as she walks down
kinetic energy at the top of the stairs; kinetic energy as she walks down
potential energy at the top of the stairs; kinetic energy as she walks down
The picture below shows a pinwheel that Bobby has in his front yard.
Often Bobby sees his pinwheel spinning, but other times it does not spin. Which statement best explains what makes his pinwheel spin?
(1 point)
Responses
The colors on the wheel repel one another, causing it to turn.
The colors on the wheel repel one another, causing it to turn.
Energy from the ground shakes the wheel causing the pinwheel to move.
Energy from the ground shakes the wheel causing the pinwheel to move.
The Sun heats up the pinwheel, causing it to turn.
The Sun heats up the pinwheel, causing it to turn.
Energy from the wind pushes on the wheel causing the pinwheel to move.
Energy from the wind pushes on the wheel causing the pinwheel to move.
he picture illustrates the solar panels that power all of the appliances in Joshua's house. What energy transformations occur that enable Joshua to bake cookies for his family in the oven? (1 point)
Responses
light energy → electrical energy → heat energy
light energy → electrical energy → heat energy
light energy → electrical energy → chemical energy
light energy → electrical energy → chemical energy
heat energy → chemical energy → light energy
heat energy → chemical energy → light energy
heat energy → light energy → heat energy
light energy → electrical energy → heat energy
As energy is transferred or conserved, some of that energy becomes unavailable to do work. What happens to this unavailable energy?(1 point)
Responses
The unavailable energy is conducted
The unavailable energy is conducted
The unavailable energy is given off as heat
The unavailable energy is given off as heat
The unavailable energy is given off as microwaves
The unavailable energy is given off as microwaves
The unavailable energy is destroyed
The unavailable energy is given off as heat.
Betsy uses an electric alarm clock to wake up for school. What energy transformation happens in the alarm clock to help her wake up?(1 point)
Responses
sound energy converts to kinetic energy
sound energy converts to kinetic energy
chemical energy converts to electrical energy
chemical energy converts to electrical energy
electrical energy converts to sound energy
electrical energy converts to sound energy
electrical energy converts to heat energy
electrical energy converts to sound energy
An aluminum block has a starting temperature of 300oC. The block is placed into 200 milliliters of water, which has a temperature of 20oC. What heat transfer will occur?(1 point)
Responses
Heat will flow from the block to the water until both substances have a temperature between 20 degrees Celsius and 300 degrees Celcius.
Heat will flow from the block to the water until both substances have a temperature between 20 degrees Celsius and 300 degrees Celcius.
Heat will flow from the block to the water until both substances have a temperature of 20 degrees Celcius.
Heat will flow from the block to the water until both substances have a temperature of 20 degrees Celcius.
Heat will flow from the block to the water until both have a temperature of 300oC.
Heat will flow from the block to the water until both have a temperature of 300oC.
Heat will flow from the block to the water until both substances have the same temperature as their container.
Heat will flow from the block to the water until both substances have the same temperature as their container.
Two samples of pure water are mixed with food coloring. One sample is red, and the other is blue. When the two water samples are combined, the red water floats on top of the blue water. Which statement best explains this result? (1 point)
Responses
The red water is colder and is more dense.
The red water is colder and is more dense.
The blue water is colder and is less dense.
The blue water is colder and is less dense.
The red water is warmer and is less dense.
The red water is warmer and is less dense.
The blue water is warmer and is more dense.
The red water is warmer and is less dense.
Which investigation would best show the transfer of heat energy without any type of matter as a medium?(1 point)
Responses
an investigation of conduction using collisions between particles
an investigation of conduction using collisions between particles
an investigation of radiation using electromagnetic waves
an investigation of radiation using electromagnetic waves
an investigation of conduction through movement of particles within a solid
an investigation of conduction through movement of particles within a solid
an investigation of radiation using a current within a fluid
an investigation of radiation using electromagnetic waves
Convection ovens cook food more evenly than a standard thermal oven. Which statement explains how a convection oven works?(1 point)
Responses
Hot air is transferred through density differences when hot air rises and cool air sinks.
Hot air is transferred through density differences when hot air rises and cool air sinks.
Hot air is transferred when heat radiates from a thermal burner.
Hot air is transferred when heat radiates from a thermal burner.
Hot air is transferred through direct molecule contact.
Hot air is transferred through direct molecule contact.
Hot air is transferred through density differences when cool air rises and hot air sinks.
Hot air is transferred through density differences when hot air rises and cool air sinks.
People use oven mitts to avoid getting burns when moving hot metal pans while cooking. Which physical property of the metal pan requires the use of an oven mitt when it is hot?(1 point)
Responses
High solubility
High solubility
Low magnetism
Low magnetism
Low thermal conductivity
Low thermal conductivity
High thermal conductivity