U5 Energy: Question Preview (ID: 22416)


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On a 3-pronged plug, 1 of the flat prongs carries current from the supply that enters the electrical outlet. The other returns the current to the service panel of the building. What would be a correct prediction for the purpose of the round prong?
a) It also carries current from the outlet. b) It decreases the amount of electric current entering the outlet. c) It carries any extra current away, preventing a shock. d) It increases the amount of electric current entering the outlet.
Billy Bob Joe had two toy cars. One car had a spring which he wound up before the car would move. The other car did not have a spring, but it needed a battery to work. How are the two cars different?
a) Both transform electrical energy into motion, but they get the electrical energy in different ways. b) One car works only on a level surface, and the other can move up a ramp. c) There is no difference between the two cars because they both move forward on a surface. d) The two cars transform different kinds of energy into motion.
Which example is an example of light energy?
a) a plant b) a battery c) a light switch d) a candle
When an electric current runs through a doorbell buzzer, a mechanism inside vibrates back and forth and makes the doorbell work. Which energy transformation occurs when someone pushes the button on a doorbell?
a) motion energy and sound energy into electrical energy b) motion energy into electrical energy and sound energy c) electrical energy into heat energy and sound energy d) electrical energy into motion energy and sound energy
Imagine you bring a negatively charged rod near a piece of metal. What happens within the metal?
a) Protons in the metal move away from the rod. b) Protons in the metal move toward the rod. c) Electrons in the metal move toward the rod. d) Electrons in the metal move away from the rod.
When an electric current runs through a doorbell buzzer, a mechanism inside vibrates back and forth and makes the doorbell work. Which energy transformation occurs when someone pushes the button on a doorbell?
a) electrical energy into motion energy and sound energy b) motion energy into electrical energy and sound energy c) electrical energy into heat energy and sound energy d) motion energy and sound energy into electrical energy
You rub 2 balloons on your hair on a dry day. Your hair is attracted to both balloons. Then, you bring the balloons near one another. How would you describe what happens to the balloons?
a) Opposite charges make one balloon become larger and one become smaller. b) They attract one another. c) They repel one another. d) They neither attract nor repel one another.
When Silly Sally Sue left her bedroom, she flipped the light switch. The light bulb on her lamp stopped giving off light. What caused the light bulb to go out?
a) The electric current stopped, so light energy could not be converted into electrical energy. b) The filament in the bulb stopped moving, so it could not make light. c) The bulb became cooler, so the light bulb stopped converting heat energy into light. d) The electric current stopped, so no more electrical energy was converted into light.
Balloons in Billy Bob Joe's investigation are rubbed with a wool cloth and placed next to each other. They move away from each other. What must be true of the balloons?
a) They have opposite charges. b) Neither of them has a charge. c) They have the same charge. d) One of them has a charge and the other does not.
Silly Sally Sue is combing her hair. After a while, she notices that the comb attacts the hairs on her head. Which explanation best describes why the hairs are attracted to the comb?
a) Combing the hairs gave them a charge that is the same as the charge on the comb. b) Combing the hairs gave them a charge that is opposite the charge on the comb. c) Combing the hairs caused them to lose their static charge. d) Combing the hairs caused the comb to lose its static charge.
If you place a shiny, new nail outside in a wet location, how will the air and water change the nail?
a) It will cause the nail to cool down. b) It will dry out the nail. c) It will make the nail decrease in volume. d) It will cause the nail to chemically change.
When 2 balloons normally hang closely together, they do not touch. When they are rubbed with a wool cloth, what happens when the balloons are placed near one another?
a) They are close together but do not touch. b) They touch one another and pop. c) They push one another apart. d) They touch one another and stick together.
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