Review: Unit 5- Energy

When one form of energy is converted into other forms of energy, the total amount of energy

• varies throughout the conversion.

• 
  increases because some energy is created.

• remains constant throughout the conversion.

• 
  decreases because some energy is destroyed.

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What is the difference between potential energy and kinetic energy?

• Potential energy is the energy of an object due to its position, while kinetic energy is energy due to its motion.

• Potential energy is the energy of an object due to its motion, while kinetic energy is energy due to its position.

• Potential energy is the energy of an object due to an applied force, while kinetic energy is energy stored after the applied force.

• Potential energy is the energy stored after an applied force, while kinetic energy is the energy used from the applied force.

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Panels of solar cells are used to collect energy from the Sun and convert it into energy for use in homes. Into what type of energy is the solar energy converted?

• chemical

• electrical

• geothermal

• hydroelectric

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NGSS.MS-PS3-3

The human body produces motion by changing chemical energy into mechanical energy. Which of these best describes what happens to the energy?

• The total amount of energy increases.

• The total amount of energy is constant.

• The energy is destroyed through motion.

• The amount of chemical energy increases.

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In which object does chemical energy most likely transform into electrical energy?

• a candle

• a mirror

• a flashlight

• a television

Coal, oil, and natural gas have high potential energies, which makes them valuable energy resources. In order to benefit from the energy available in these fossil fuels, the potential energy is converted most directly into which type of energy?

• chemical

• electrical

• solar

• thermal

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NGSS.MS-PS3-4

To produce light, the atoms inside a light bulb transform electrical energy into what other kind of energy?

• heat

• chemical

• mechanical

• electromagnetic

A book held 1 meter above the floor has potential energy. The book is dropped and hits the floor. To what types of energy has the potential energy of the book been converted?

• kinetic, sound and heat

• kinetic, chemical and sound

• chemical, mechanical and heat

• sound, chemical and mechanical

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Which best represents the use of mechanical energy?

• a light bulb giving off heat

• a candle providing light

• a nail being hammered

• a can rusting

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A device that converts light energy into electricity used in many handheld calculators is a

• battery.

• photocell.

• photo generator.

• photovoltaic cell.