Energy and Energy Transformation Review

6.9(C) Released A cook heats a meal in a microwave oven. What energy transformations occur between the microwave oven and the meal?

• Electrical energy to light energy to sound energy.

• Chemical energy to thermal energy to light energy.

• Electrical energy to electromagnetic energy to thermal energy.

• Chemical energy to electromagnetic energy to chemical energy.

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6.9(C) Released A teacher rubbed a match against a piece of sandpaper. The match started to burn. Which statement best describes the energy changes that occurred?

• The chemical energy stored in the match changed to thermal energy and light energy.

• The thermal energy stored in the match changed to light energy and chemical energy.

• The light energy and thermal energy stored in the match changed to mechanical energy.

• The light energy and thermal energy stored in the match changed to chemical energy.

6.8(A) Released A bicycle rider is traveling up a hill. When the rider reaches the top of the hill, she stops to rest. Then she travels down the hill. The diagram shows the rider in the three different positions. Which of these correctly describes the potential energy and kinetic energy of the bicycle rider?

• As the rider reaches the bottom of the hill, her kinetic energy and her potential energy decrease.

• As the rider moves up the hill, her kinetic energy increases, and her potential energy decreases.

• When the rider goes down the hill, her potential energy increases, and her kinetic energy decreases.

• When the rider is at the top of the hill, her potential energy is the greatest, and her kinetic energy is the least.

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6.8(A) Released Deshun used the diagram to describe changes in the potential and kinetic energy of the water. At which location is the gravitational potential energy of the water the greatest?

• Location W

• Location X

• Location Y

• Location Z

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NGSS.MS-PS3-2

6.9(C) Released The main parts of a working clothes dryer are shown in the diagram. This appliance dries clothes primarily by converting —

• electrical energy to heat and mechanical energy

• mechanical energy to heat and electrical energy

• electrical energy to heat and light

• mechanical energy to heat and vaporization

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6.9(C) Released In Africa there is a lot of different predators and prey. One of Lion’s favorite meals is zebra. When a lion eats a zebra and then uses the energy from the zebra to run, the lion’s body converts –

• chemical energy to light energy

• chemical energy to mechanical energy

• electrical energy to chemical energy

• mechanical energy to chemical energy

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What is the possible or stored energy in an object called?

• Thermal energy

• Kinetic energy

• Chemical energy

• Potential energy

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How does potential energy become kinetic energy?

• When something hot touches something cool, the potential energy in the hot object is turned into kinetic energy in the cool object.

• When an outside force acts upon an object with potential energy, that force turns the potential energy into kinetic energy.

• Potential energy becomes kinetic when an object remains in place and continues to build up more and more energy.

• Potential energy has no relation to kinetic energy.

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NGSS.MS-PS3-2

Which of the following is an example of kinetic energy?

• a vase sitting on a table

• sound

• a plate of hot food

• a parked car

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NGSS.MS-PS3-5

What is thermal energy?

• energy from sound

• potential energy in chemical compounds

• the movement of electrons

• heat

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