Unit 4 Energy Transformations

Energy is changed from one form to another during an energy transformation. Which of the following is an example of a transformation of electrical energy into another kind of energy?

• a light bulb lighting up

• a motor making a noise

• a heater feeling warm

• all of these

Lola placed a flask of room-temperature water over a flame. When the water started to boil, she placed a room-temperature copper rod into the flask. During the experiment, Lola wrote the four notes shown above in her lab journal. Which notes are observations supporting the idea that energy can be transferred from one place to another? Select each correct answer. More than one answer may be correct

• It is harder to see through the water when it is boiling.

• The temperature of the water went up when it was over the flame.

• The flask containing the boling water was made of glass.

• After five minutes in the flask, the end of the copper rod was hot to the touch.

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NGSS.MS-PS1-4

NGSS.MS-PS3-5

Select each correct image. More than one image may be correct. Which of the following closed circuits show that energy is being transferred?

• 
• 
• 
• 

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NGSS.MS-PS3-5

Sean loves riding his bike, but his parents will not let him ride it in the evenings. They say that it is dangerous because drivers cannot see him from very far away. Sean thinks of several solutions that could solve his problem. Which of these solutions would change stored energy into light energy? Select EACH correct answer. More than one answer may be correct.

• Sean could put solar-powered lights on the bike. After sitting in the sun all day, the lights will shine when turned on.

• Sean could put electric lights on the bike. Then he could use batteries that can be charged every night by hooking them up to an electrical outlet.

• Sean could put electric lights on the bike. Then he could use a small windmill to change the energy of the bike's motion into electricity for the lights.

• Sean could put reflectors on the bike. When light hits the reflectors, it will bounce off in many directions.

Look at the circuit above. Where would you look to find evidence of energy transfer?

• . the fan at position X

• the battery at position Z

• the wires at position Y

• all of these

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NGSS.MS-PS3-5

Kelly has two toy cars. Both cars have the same mass, but each car has a different electrical circuit inside. These electrical circuits convert electrical energy into motion energy which causes the cars to move. How could Kelly find out which car converts the most electrical energy into motion energy?

• test the speed of the cars

• measure the size of each car's tires

• measure the weight of each car

• test the loudness of the cars

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

Electrical energy can produce many other types of energy. When electricity runs through a light bulb, what other type of energy is produced?

• light energy

• mechanical energy

• chemical energy

• sound energy

Above is a sketch Wilton made of his solution to an engineering design problem. When the fan spins, the light bulb turns on. What was Wilton's solution designed to do?

• use moving air to produce stored energy

• use light energy to move air

• use moving air to produce light energy

• use stored energy to move air

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NGSS.MS-ETS1-1

NGSS.MS-PS3-5

Stevan is playing in the park on a sunny summer day. The park he is playing at has both grass and asphalt. Stevan notices that the asphalt feels hotter than the grass in the park. What statement explains the energy transfer in the asphalt?

• Some of the light energy from the asphalt is transferred into heat energy in the Sun.

• Some of the heat energy from the asphalt is transferred into light energy in the Sun.

• Some of the light energy from the Sun is transferred into heat energy in the asphalt.

• Some of the heat energy from the Sun is transferred into light energy in the asphalt.

Wayne and his family are designing a passive solar heater to keep their barn warm in the winter. A passive solar heater converts light energy into heat energy. What is the most important information for Wayne and his family to consider in their design?

• the location of the Sun in the winter

• the amount of energy stored in the Sun

• the amount of sound created by the energy conversion

• the location of the electrical outlets in the barn

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NGSS.MS-ETS1-1

NGSS.MS-PS3-3