Energy Conversions and Energy Transfer

A student drops a book to the floor to investigate how energy changes into sound. When the book hits the floor, it makes a loud sound. How was the sound produced?

• Electrical energy was produced when the book hit the floor. This produced a sound.

• Energy of motion from the falling book was converted to heat. The heat produced a sound.

• Electrical energy was produced as the book fell to the floor, which caused a sound to be produced.

• Energy of motion from the falling book was transferred to the floor, which caused a sound to be produced.

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NGSS.MS-PS3-5

Gina and Jordan want to make food for a few guests. They decide to use a solar cooker, but they haven't used one before. They will use their knowledge about energy transfer and changes in types of energy to make sure the cooker works. They will also make changes so the cooker works better. Use this information to help you answer the next 4 questions. Are you ready!

• Yes, I love science! I'm ready for the challenge!

• Don't choose this answer.

• Definitely don't choose this one.

• Please, don't choose me!

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Gina convinces Jordan to use the solar cooker to prepare their meal. Jordan takes the cooker outside and places it under a large shade tree in their backyard. Gina explains that for the solar cooker to work, they should place it in a different location. Gina and Jordan need to find a better location for the solar cooker. Which best supports your answer to the previous question?

• The solar cooker will use wind energy to cook the food.

• The solar cooker will use the heat from inside the home to cook the food.

• The solar cooker will use electrical energy and convert it to heat energy to cook the food.

• The solar cooker will use light energy from the sun and convert it to heat energy.

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Gina and Jordan find a good location for their cooker. However, after testing the cooking, they find that is not working very well. They decide to look at the parts of the cooker to find the problem. Gina and Jordan notice that the inside of the cooker is white. Jordan knows that white surfaces reflect light. This means that when sunlight hits the surface, some of the light will be reflected out of the cooker. Jordan suggests that they replace the white surface with a darker material . Explain why lining the cooker with a dark material will create more heat inside the cooker.

• The dark material will reflect the light away from the solar cooker.

• The dark material will absorb more light energy. The more light energy it holds, the more heat energy it will hold.

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NGSS.MS-PS3-3

Two bowling balls are rolling down two bowling lanes. The white ball is traveling at the speed of 14 miles per hour. The black ball is traveling 12 miles per hour. Which statement explains the energy demonstrated in this example?

• The black ball has more energy than the white ball.

• The white ball has more energy than the black ball.

• The black ball has a greater ability to create energy than the white ball.

• The white ball has a greater ability to create energy than the black ball.

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Desmond was given a solar cooker. It takes 50 minutes to cook food when placed in direct sunlight. He wants to test variations of this design to fine one that can cook the food faster. He changed one variable at a time to test a variety of designs. He also noted the cost that was necessary to make each change. The data are in the table. Based on Desmond's criteria, which design should he choose?

• 
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Explain your reasoning for choosing your answer above.

• This design was the cheapest option, yet it took longer to cook the food.

• This design took the longest to cook the food, but cost nothing.

• This design cooked the food in the least amount of time, and cost nothing.

• This design cooked the food in the least amount of time, despite the small cost.

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Gina wants to use the solar cooker to prepare the meal. Jordan would rather use their electric oven, because it prepares meals quickly and easily. Gina wants to convince Jordan to use the solar oven instead. Which statement provides the best evidence for the benefits of cooking with a solar oven?

• Solar cookers are powered by the sun, which makes them much easier to control than electric ovens.

• Solar cookers are powered by wind energy instead of Go away. Wind energy is a renewable and clean energy source.

• Solar cookers are powered by gas instead of energy from the sun. Unlike energy from the sun, gas is a renewable source of energy.

• Solar cookers are powered by energy from the sun. Using energy from the sun is cleaner than burning gas, and the sun is a renewable source of energy.

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NGSS.MS-PS3-3

Gina convinces Jordan to use the solar cooker to prepare their meal. Jordan takes the cooker outside and places it under a large shade tree in their backyard. Gina explains that for the solar cooker to work, they should place it in a different location. Gina and Jordan need to find a better location for the solar cooker. Which of the following best describes what they should do?

• The solar cooker should be placed near the house so they can plug it in.

• The solar cooker should be placed in a location where the wind is blowing.

• The solar cooker should be placed in the house because it is warmer inside.

• The solar cooker should be placed in a location that gets as much sunlight as possible.

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NGSS.MS-ETS1-4

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Now that Gina and Jordan have replaced the white lining, they are almost ready to test their cooker again. Before doing so, Gina suggests they wrap newspaper around the cooker. Gina hopes that this will keep heat from leaving the cooker. Gina hopes that this will keep heat from leaving the cooker. Jordan does not think that wrapping the cooker with newspaper is necessary. He thinks that once heat is inside the cooker, ti will not be able to escape. Write the correct words from the word back to complete the sentence below.  _____________ is correct. Heat energy ______________ move from one place to another.

• _____ is correct. Heat energy _____ move from one place to another.

  Jordan/can not

• _____ is correct. Heat energy _____ move from one place to another.

  Jordan/can

• _____ is correct. Heat energy _____ move from one place to another.

  Gina/can

• _____ is correct. Heat energy _____ move from one place to another.

  Gina/can not

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