Energy Checkpoint 3 review

Patricia is making a model to explain to her class how energy is neither created nor destroyed. She has the following objects to work with. How can she demonstrate to the class that energy is not created or destroyed but only changes from one form to another?

• Patricia can stir the water in the bottle using the copper wire and use the digital scale to show no change in mass from the motion.

• Patricia can warm the ice cubes in the bowl using the light bulb and use the digital scale to show no change in mass of the bowl of melting ice.

• Patricia can attach the battery to the light bulb using the copper wire and use the thermometer to show the change in temperature near the bulb.

• Patricia can pour the water from the bottle onto the ice cubes in the bowl and use the thermometer to show the change in temperature of the water.

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NGSS.MS-PS3-4

The Law of Conservation of Energy states energy is not created nor destroyed. Why is this statement considered to be a scientific law, and NOT a scientific theory?

• This statement involves claims made by an individual without evidence.

• This statement is a testable prediction that can be proven right or wrong.

• This statement is a well-supported and widely accepted explanation of nature.

• This statement tells what happens under certain conditions in the natural world.

Based on the chart, which conclusion should be made?

• The farther the rubber band travels, the more it can be stretched later.

• There is no relationship between the length the rubber band was stretched and the distance it traveled.

• The greater the potential energy stored in the rubber band as it’s stretched, the longer distance it travels.

• The greater the potential energy stored in the rubber band as it’s stretched, the shorter distance it travels.

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Elionay wants to describe how energy is transformed and conserved when a stereo system is used. Which of the following descriptions should he use to fill in the “Energy Out” section of his chart?

• 80 J of sound energy

• 60 J of sound energy and 40 J of thermal energy

• 70 J of sound energy and 30 J of nuclear energy

• 70 J of sound energy and 20 J of kinetic (motion) energy

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Which energy transformation is taking place in the grass and tree in the model above?

• Transforming chemical energy into mechanical energy

• Transforming mechanical energy into electrical energy

• Transforming electromagnetic (light) energy into chemical energy

• Transforming electromagnetic (light) energy into electrical energy

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According to the Law of Conservation of Energy, what can you conclude about the energy used by the lamp?

• The lamp’s energy is created when the lamp turns on.

• The thermal and light energy given off by the lamp is destroyed.

• The lamp releases more thermal and light energy than what it receives from the solar panel.

• The solar panel transforms electromagnetic (light) energy from the Sun into electrical energy to power the lamp.

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A student states that the total energy of the ball is greatest at Point C. Is this student correct?

• No, the total energy is greatest at Points A and E.

• No, the potential energy is greatest at Point C, but the total energy is the same at all the points shown.

• Yes, the kinetic energy is greatest at Point C, which means its total energy is the greatest at this position as well.

• Yes, the potential energy is greatest at Point C, which means its total energy is the greatest at this position as well.

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What happens between Point C and Point E?

• Potential energy is converted to kinetic energy.

• Kinetic energy is converted to potential energy.

• The total energy of the ball increases from Point C to E.

• The total energy of the ball decreases from Point C to E.

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Where in the pendulum’s path is potential energy being transformed into kinetic energy?

• From A to B and B to C

• From A to B and C to B

• From B to A and B to C

• From A to C and C to A

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NGSS.MS-PS3-5

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Which statement below best explains how this data demonstrates the law of conservation of energy?

• The total amount energy before the reaction is equal to the total amount of energy after the reaction.

• The total amount of chemical energy before the reaction is equal to the thermal energy after the reaction.

• The total amount of thermal energy before the reaction is equal to the amount of thermal energy after the reaction.

• The total amount of chemical energy before the reaction is equal to the amount of chemical energy after the reaction.

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