Unit 3 Energy Conversions

Two cars are racing; the blue car is traveling at a speed of 85mph and the red car is traveling at a speed of 97mph. Which of the following statements explains the energy demonstrated in this example?

• The red car has more energy than the blue car.

• The blue car has more energy than the red car.

• The red car has a greater ability to create energy than the blue car.

• The blue car has a greater ability to create energy than the blue car.

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Aliyah's town relies on energy from wind to power lights in her school. Her friend Jayce lives in another town that does not have a lot of wind. he doesn't understand how wind can make the lights stay on in her school. Which of the following is the best explanation Aliyah can provide to Jayce about how this works?

• Motion energy is converted to thermal energy.

• Motion energy is transferred to solar energy and then to electrical energy.

• Motion energy is created by solar energy.

• Motion energy is converted into electrical energy.

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Which of the following are benefits (good things) of solar energy when compared to using fossil fuels? Select 2 answers.

• solar energy produces less pollution than fossil fuels

• solar energy is a renewable source of energy

• solar energy is a non-renewable source of energy

• solar energy is more expensive than fossil fuels

Thad wants to make improvements to a solar cooker he was given. The solar cooker takes 1 hour to cook food when placed in direct sunlight. He wants to make changes to this design to be able to cook food faster that won't cost much extra money. He tests many designs; which one best meets the criteria?

• He paints the outside of the cooker black to absorb more light--this design cooked the food in 40 mins and costed $1.00 for the paint.

• He removes the cooker from direct sunlight--this design cooked the food in 2 hours, but cost $0.

• He removes the foam from around the cooker--this design cooks the food in 1.5 hours, but cost $0.

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Which of the following explains how energy is transferred in this device?

• heat energy moves from the wires to the outlet

• light energy moves from the wires to the bulb

• electrical energy moves from the wires to the light bulb.

• motion energy moves from the wires to the light bulb

Which of the following explains the energy in this example?

• electrical energy is transferred to the air

• electrical energy is transformed to thermal energy

• motion energy is transformed into light energy

• motion energy is transferred to electrical energy

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Every time Rowan and Cove go camping, their flashlights don't last very long once it turns dark outside. They want to design a solar powered light that will last the longest and solve their problem. What steps should they take first to find the most effective solution?

• test only the design that is the cheapest to make

• ask their friends which design they think will work best

• test different designs and choose the design that works the best

• test only the design that is the easiest to make

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A city relies on the river to provide electricity. How does this work?

• electrical energy from the water is transformed into motion energy

• electrical energy from the water is transformed into thermal energy

• motion energy from the water is transformed into electrical energy

• motion energy from the water is transformed into sound energy

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Brentlee slams the door to investigate how energy changes into sound. When the door slams closed it makes a loud sound. How was the sound produced?

• Electrical energy was produced when the door slammed shut.

• Energy of motion from the door was converted to heat. Heat produced the sound.

• Electrical energy was produced as the door slammed shut, which caused a sound to be made.

• Energy of motion from the door was transferred to the air, which caused a sound to be made.

Zuri wants to use a solar powered water heater to heat the water in her home. Anaya would rather use an electric water heater because it heats the water more quickly and easily. Zuri wants to convince Anaya to use a solar powered water heater; which is the best argument in favor of using the solar heater?

• solar water heaters get hotter than electric water heaters

• solar water heaters are easier to use than electric ones

• solar water heaters are more reliable than electric ones

• solar water heaters are better for the environment than electric ones