Energy Unit Test Review

Which best explains why the temperature is NOT increasing between lines AB and CD?

• Temperature must be held steady while changing from one phase to another.

• Temperature does not affect the amount of energy needed for a phase change.

• The energy that causes the temperature to increase is absorbed by the molecules during a phase change.

Tags

NGSS.MS-PS1-4

Which of the following is true when the kinetic energy of the particles in a sample of matter is lowered?

• The temperature increases.

• The temperature decreases.

• The sample will absorb less heat.

• More heat flows away from the sample.

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

NGSS.MS-PS1-4

Some dams are designed to make electricity. How do dams make electricity?

• The force of the moving water makes energy that the dam changes into electricity.

• 
  The force of gravity pulling down on the dam creates energy that turns into electricity.

• The light energy hitting the water from the Sun makes energy that the dam can change into electricity.

• The sound energy made by the water moving through the dam creates energy that turns into electricity.

Tags

NGSS.MS-PS3-5

When a system transforms energy from one type to another, the system always experiences

• energy loss through heat.

• energy gain through light.

• mass gain through nuclear reaction.

• mass loss through chemical reaction.

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NGSS.MS-PS3-4

NGSS.MS-PS1-4

A student investigates the energy transformations that occur within a laptop. Which statement BEST predicts the total amount of energy before and after the laptop is plugged in and powered on?

• There is less energy before the transformation than after because none of the energy is converted to thermal energy.

• There is more energy before the transformation than after because some of the energy is converted to thermal energy.

• The amount of energy before the transformation is the same as the amount of energy after, and none of the energy is converted to thermal energy.

• The amount of energy before the transformation is the same as the amount of energy after, and some of the energy is converted to thermal energy.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

NGSS.MS-PS3-3

Which is the correct sequence of energy transformations in a cell phone?

• Chemical energy to light energy and nuclear energy

• Electromagnetic energy to light energy and chemical energy

• Electromagnetic energy to chemical energy and thermal energy

• Chemical energy to electromagnetic energy and thermal energy

A student conducts an experiment that involves the transfer of energy. The student places one metal spoon, one plastic spoon, and one wooden spoon in a glass that contains hot water. A small pat of butter is placed onto each spoon.

The pat of butter on the metal spoon is the first to melt and slide down the spoon. Which of the following descriptions BEST explains the results of this experiment?

• 
  The metal material has a rigid structure with little molecular movement, allowing heat to transfer directly from one end of the spoon to the other.

• The metal material is made up of well-spaced molecules, allowing the heat to travel through the air pockets and reach the butter the fastest.

• The metal material transfers energy from molecular collisions up the length of the spoon the fastest, allowing the heat to reach the butter the fastest.

Tags

NGSS.MS-PS3-5

Octavian is building a solar powered car. He turns the switch on and places the car on a sidewalk. The car moves forward on the ground. Identify the parts of the system that transform energy and describe their role in the system.

• Solar panel: transforms light energy into electrical energy

  Motor: transforms electrical energy into mechanical energy

• Switch: transforms light energy into electrical energy

  Wheels: transform electrical energy into mechanical energy

• Switch: transforms light energy into chemical energy

  Wires: transform chemical energy into electrical energy

  Motor: transforms electrical energy into mechanical energy

Tags

NGSS.MS-PS3-1

Heating food in a toaster oven is converting energy in which sequence.

• chemical energy to heat energy
• solar energy to heat energy
• mechanical energy to heat energy
• electrical energy to heat energy

Tags

NGSS.MS-PS3-5

What two factors affect kinetic energy?

• density and temperature
• force and acceleration
• volume and pressure
• mass and velocity

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-1