At the end of a long road trip, Josh noticed the tires of the car were very hot.
Which of these caused the tires to become hot?
heat from the outside air
rubber in the tires
heat from the car’s engine
friction between the road and the tires
Hydroelectric plants generate power by utilizing the flow of water to turn a turbine. This, in turn, generates power that is then distributed for use in homes and businesses. What type of energy transformation is occurring at the hydroelectric plant?
Electric energy is transformed into light energy.
Kinetic energy is transformed into electric energy.
Light energy is transformed into potential energy.
Chemical energy is transformed into kinetic energy.
A flashlight uses three different forms of energy. Which of the following is the correct order of the energy transformation to power the flashlight?
Mechanical — Thermal — Light/Heat
Electrical — Chemical - Light/Heat
Chemical — Electrical —Light/Heat
Light/Heat — Electrical — Chemical
Kyle is riding his bicycle. He works very hard to reach the top of a hill and then coasts down the other side. Which statement best explains why Kyle does not need to work as hard as he travels downhill?
Kinetic energy is stored in the bicycle
There is less friction between the road and the bike as it moves downhill
No energy is lost as heat as Kyle rides downhill
Potential energy is converted to kinetic energy as he moves downhill
__________ is the energy carried from one object to another because of temperature.
Traditional incandescent bulbs are 10 percent efficient. This means that only 10 percent of the electrical energy used is turned into light.
What happens to most of the remaining energy?
It is given off as heat.
It is given off as sound.
It is used up by the bulb.
It is recycled and stored in the bulb.
A variety of energy transformations can occur in different contexts or situations. Which of the following involves more than two energy transformations?
The sun heats the sand and water.
A radio plays music
A space heater warms a room
A baseball player swings a bat and hits the ball.
A swimmer is in a swim lane maintaining a constant speed toward the edge of the pool. The swimmer ceases her swim stroke and coasts to a stop. Which best describes the amount of energy lost by the swimmer while coasting to a stop?
the amount of kinetic energy gained by the water
the amount of sound energy absorbed by the water
the amount of chemical energy burned by the swimmer
the amount of mechanical energy used by the swimmer
A student pushes a toy car with his hand. The car travels a distance before slowing to a stop. The student concludes that the motion of the car destroyed the energy that his hand put into it.
Why is the student's conclusion incorrect?
Energy was recycled, but not destroyed.
Energy was converted into sound and heat, but not destroyed.
Energy from the student was gradually used up, but not destroyed.
Energy was the force that created the motion and stayed constant, but was not destroyed.
Juan's room is suddenly dark when an incandescent light bulb burns out. He attempts to replace the old bulb with a new one but realizes that the old bulb is too hot to touch. Juan waits 10 minutes and then changes the bulb when it is completely cool. What happened to the heat in the bulb?
The heat was completely destroyed.
The heat was stored as chemical energy.
The heat was transformed into electricity.
The heat was transferred to the air around it
In the lab, Kendra placed a metal stirring rod into a glass beaker of boiling water that was sitting on a stand above an open flame. Kendra leaned the metal rod against the side of the beaker. About 15 minutes later, she touched the rod and noticed it was very hot. Which of these statements best explains what caused the rod to get hot?
Heat was absorbed from the air to the metal rod.
Heat was radiated from the flame to the metal rod.
Heat was conducted from the boiling water to the metal stirring rod.
Heat was convected from the glass beaker to the metal stirring rod.
Temperature can affect the state of matter for various substances. Use the table below to answer the following question.
Which of the following statements is true based on the information in the data table above?
the atoms in matter change shape when heat is added
the atoms in matter slow down when heated
temperature physically changes matter
temperature chemically changes matter
Which of these scenarios describes the heat transfer that happens during conduction?
the heating of beach sand on a very sunny summer day
using an air conditioner to cool the upper levels of a home
taking a pan with a metal handle off the stove with bare hands
feeling warmer water at the surface of a pool than under the surface
On a sunny day in the winter when the temperature remained below freezing, Paola made a snowball and placed it on the sidewalk. A few hours later, she came back and noticed the snowball was gone and a puddle was left. In terms of heat transfer, what happened to the snowball?
Heat was transferred from the air to the snowball through radiation.
Heat was transferred from the Sun to the snowball through radiation.
Heat was transferred from the air to the snowball through conduction.
Heat was transferred from the Sun to the snowball through conduction.
Amelia puts some ice cubes in a cup of water at room temperature. Which statement describes the heat flow in this situation?
The heat flows from the ice to the water because the ice is much colder than the water.
The heat flows from the water to the ice because heat moves from warmer to cooler objects.
The heat flows form the ice and the water to the surroundings because the surroundings are warmer.
The heat flows equally from the ice to the water and from the water to the ice because both substances have heat.
Which of these describes the transfer of heat by the circulation or movement of heated material?
The diagram shows the ways that heat can be transferred when boiling a pot of water over a fire.
Which type of energy transfer is shown at the point labeled C in the diagram?
Beth heats a pot of water to cook pasta.
What may happen as a result of adding heat?
When the water begins to boil, some of the water molecules gain enough energy to change into a gas.
When the water begins to boil, some of the water molecules lose energy and change into a gas.
The water gains energy and the temperature of the pasta remains the same.
The water and the pasta both lose energy.
A teacher places a hot serving spoon in a small bowl of ice cubes.
What change will occur?
The spoon's temperature remains the same and the ice cubes melt.
The spoon's temperature decreases and the ice cubes remain solid.
The spoon's temperature remains the same and the ice cubes remain solid.
The spoon's temperature decreases and the ice cubes melt.
One part of a metal spoon is in a pot of very hot soup. How is the heat is transferred from the hot soup to the spoon?
No transfer will occur