Unit 1 - Energy

The blades of a toy helicopter spin when its circuit is connected to a battery. Which sequence below correctly identifies the energy changes taking place in the helicopter?

• chemical to electrical to potential

• chemical to electrical to mechanical

Tags

NGSS.HS-PS3-3

Which of the following gadgets best shows the transformation of energy from electrical to mechanical with the correct reasoning?

• A light bulb because electricity is being used to create light and heat.

• A fan because electricity is being used to spin the blades of the fan.

Tags

NGSS.HS-PS3-3

Two students place three ice cubes in a glass of water that was at room temperature. Which of the following scenarios would best describe the results of the investigation?

• Energy from the water will transfer to the ice cubes, causing the ice to melt.

• Cold from the ice cubes will transfer to the water, causing the water to cool.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A student decides to take up diving as a hobby. He stands on a high-dive that is 4m tall. If the student has a mass of 50 kg, what is his PE? Use the following equation to solve:

 $PE\ =\ mgh$  g = 9.8 m/s/s

• 1960 J

• 200 J

Tags

NGSS.MS-PS3-2

Choose the image below that shows potential energy decreasing then increasing if following the arrows from left to right?

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Tags

NGSS.MS-PS3-2

Choose the statement below that best describes the transfer of energy from the Sun to the Earth.

• The sun is the ultimate source of energy because it uses nuclear fusion to create heat. The thermal energy it creates radiates through the vacuum of space and heats the Earth.

• The Sun is an extremely large source of thermal energy. Because of its size, the Sun can conduct its heat through space, heating the Earth.

Tags

NGSS.MS-PS3-4

NGSS.MS-ESS2-1

NGSS.MS-ESS2-4

NGSS.MS-ESS2-6

A girl is riding her bike at a speed of 12 m/s. The girl and her bike have a combined mass of 77 kg. What is the KE of the girl and her bike? Use the formula:  

 $KE\ =\ \frac{1}{2}\ mv^2$  

• 1078 J

• 5544 J

Tags

NGSS.MS-PS3-1

If 200 J of energy were added to 1 g each of aluminum and copper, which would experience the LEAST temperature increase. Refer to the formula below:

 $Q\ =\ mc\Delta T\ \ \ \ \ \ c\ =\ specific\ heat\ capacity$  

• Aluminum (c = 0.9 J/g C), because the higher the value for specific heat, the more energy is required for temperature change.

• Copper (c = 0.39 J/g C), because the lower the value for specific heat, the more energy is required for temperature change.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A large cup of ice is poured into a glass pitcher of freshly brewed hot tea. The ice melts quickly and the tea in the glass pitcher gets much colder. If we wait twenty-four hours, what temperature would we expect the tea and ice mixture to reach?

• The tea transferred energy to the ice making it melt. The mixture will be the temperature of the hot tea.

• The tea transferred energy to the ice until they had equal amounts of energy. They will reach a temperature somewhere between each of their original temperatures.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Look at the images below and choose the one that represents and endothermic change in which water freezes.

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Tags

NGSS.MS-PS1-4