Lessons 11,12,13 p.84-99

At which point does the pendulum have the greatest potential energy?

• a

• b

• c

• d

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NGSS.MS-PS3-2

At which point does the pendulum have the greatest kinetic energy?

• a

• b

• c

• d

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Four objects are on a shelf 1.5 meters above the ground: a 350-gram trophy, a 100-gram picture frame, a 225-gram book, and a 600-gram vase. Which object has the greatest potential energy?

• book

• vase

• trophy

• picture frame

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NGSS.MS-PS3-2

A student throws a ball straight up. What happens to the ball's energy as it rises?

• The kinetic energy and potential energy of the ball do not change as it rises.

• The kinetic energy of the ball changes into potential energy as the ball rises.

• The potential energy of the ball changes into kinetic energy as the ball rises.

• The kinetic energy of the ball decreases as it rises, but its potential energy does not change.

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Which of the following is a form of potential energy?

• sound energy

• chemical energy

• thermal energy

• mechanical energy

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NGSS.MS-PS3-2

In Lesson 10, you learned that a motor uses the magnetic field produced by an electric current to spin an armature. What kind of transformation takes place inside a motor?

• Chemical energy transformed to magnetic energy

• Thermal energy transforms to electric energy

• Gravitational energy transforms to chemical energy

• Electrical energy transforms to mechanical energy

Which of the following is the best example of a form of kinetic energy being transformed into a form of potential energy?

• During photosynthesis, plants use light from the sun to build sugar molecules.

• During combustion, fuel such as wood or oil, is broken down chemically to produce heat and light.

• In a generator, an armature spinning in a magnetic field produces electric current.

• In a battery, a chemical reaction releases electrons that can flow as electric current.

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Which of the following is not a source of stored chemical energy that can be turned into a form of kinetic energy?

• a battery in a toy car

• food

• the nucleus of an atom

• fossil fuels

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NGSS.MS-PS3-5

In which direction does heat move?

• from warmer areas to cooler areas

• from cooler areas to warmer areas

• between areas of equal temperature

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NGSS.MS-PS1-4

A metal spoon is placed in a pot of boiling water. Why does the spoon become hot over time?

• Currents of hot matter travel up the spoon from the water.

• Light shining on the spoon causes it to become as hot as the water.

• Particles in the water collide with particles int he spoon, which then strike other particles in the spoon, transferring thermal energy.

• Microwaves emitted by the hot water are absorbed by the spoon and transformed into thermal energy.

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