Law Of Conservation Of Energy Question Preview (ID: 33375)
Law Of Conservation Of Energy.
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As the cars of a rollercoaster race down a hill, energy transformations take place. Which of the following is true?
a) Some potential energy is transformed to kinetic energy and other forms of energy.
b) Some energy is destroyed as the car slows down.
c) The kinetic energy of the cars is equal to the potential energy of the cars.
d) Kinetic energy is stored in the cars as they move downhill.
What cannot happen to energy according to the law of conservation of energy?
a) Energy cannot be created
b) Energy cannot be changed.
c) Energy cannot be converted.
d) Energy cannot be transformed.
Energy cannot be created or destroyed. Which statement about energy is correct?
a) A little energy is lost every time an energy transformation occurs.
b) Energy can change form, but energy can never change in total amount.
c) Conservation of energy occurs only when some of the energy is converted to light.
d) Because of the conservation of energy, it is possible to have a machine that would never need energy.
The following equation illustrates the chemical reaction that occurs in a plant. Water + carbon dioxide + light energy to sugar + oxygen. Based on the law of conservation of energy, what happened to the light energy in the reaction?
a) It was destroyed.
b) It was produced by the plant.
c) It was changed into oxygen gas.
d) It was converted into chemical energy stored in the sugar.
Friction is a force that opposes motion. When friction is present, heat is usually generated. According to the law of conservation of energy, which of the following statements is true about the energy associated with friction?
a) The law of conservation of energy does not apply.
b) It was not transformed from another type of energy
c) Some of the energy is converted into thermal energy.
d) Energy is created with friction.
Which of the following would BEST demonstrates how energy behaves?
a) Kendra performed an experiment to demonstrate friction by rubbing her hands together for 50 seconds. She noticed her hands be
b) Isaiah performed an experiment where he heated 40 g of ice cubes until they changed state to a gas.
c) Annabelle performed an experiment where she dropped a tennis ball 35 times and counted the number of bounces .
d) Cameron performed an experiment in which he kept ice from melting for 1 hour.
Which statement BEST explains why a bouncing basketball will not remain in motion forever?
a) The energy is transferred to heat and chemical energy.
b) The energy is transferred to light and potential energy.
c) The energy is used up and destroyed.
d) The energy is transferred to sound and heat energy.
The unit for energy is the joule (J). If the energy content of an object is 1,000 J, but then later it is found to be 900 J, what happened to 100 J of its energy?
a) Energy was created.
b) Energy was destroyed.
c) The object transferred some of its energy to its surroundings.
d) The object absorbed additional energy from its surroundings.
Larissa is a very energetic person and has a hard time sitting still in class. One time in math class, her teacher asked Larissa where she got all of her energy. Since Larissa had just studied energy in science class, she knew the correct answer. Wha
a) “I create it!”
b) “I just transform it.”
c) “I can get energy anywhere I want.”
d) “I make energy whenever I need it.”
Energy cannot be created nor destroyed, only changed from one form to another. How does listening to music on a radio obey the law of conservation of energy?
a) Electrical energy is converted into other forms of energy, such as sound.
b) Electrical energy remains unchanged.
c) Electrical energy is gradually destroyed as the radio plays.
d) Sound energy is changed into potential energy.
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