Energy Julie

Coal is often burned to produce electricity, yet the amount of electrical energy produced is less than the chemical energy stored in the coal. Which best explains this observation?

• The amount of chemical energy in fuels is lost.

• A portion of the chemical energy stored in coal is converted into other forms of energy other than electricity.

• As coal is heated, some of the molecules move so fast that they are destroyed.

• A part of the energy in coal is destroyed by the intense heat required to release its potential energy.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Energy B describes solar energy. Which of the following is the best example of solar energy being used?

• driving a nail into a board with a hammer

• causing vinegar to fizz by adding baking soda

• using a vacuum cleaner that is plugged into the wall

• starting a fire with a magnifying glass instead of matches

Tags

NGSS.MS-LS1-6

Which form of energy is collected by the solar panels?

• radiant

• mechanical kinetic

• thermal

• chemcial

At which location does the skateboarder have the most kinetic energy and the least potential energy?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Bradley is standing on the top of a mountain holding a soccer ball. Which of these best describes what happens when he throws the ball over the edge?

• The kinetic energy decreases and the total amount of energy increases.

• the kinetic energy increases and so does the total amount of energy.

• Both the kinetic and potential energy change, but the total energy remains constant.

• The potential energy decreases and the total amount of energy also decreases.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Joshua hooks a rubber band between his thumb and forefinger. He moves his fingers apart, stretching the rubber band.With a quick, sudden motion, he bends his thumb forward so that the rubber band slips off. What happens next?

• The elastic potential energy stored in the stretched rubber band changes to kinetic energy.

• The elastic potential energy stored in the rubber band changes to heat energy.

• The chemical potential energy stored in Joshua's body changes to kinetic energy.

• The chemical potential energy stored in Joshua's body changes to elastic potential energy in the rubber band.

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A wood burning stove gives off heat to a room. What effect does it have on the air molecules in the room?

• It increases their speed

• It increases their energy loss

• It decreases their mass.

• It decreases their volume

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which student do you agree with more?

• Jaime thinks that the little girl possess the most potential energy at in between points A and B because she is falling.

• Julie believes that the point B has more potential energy because that is the point that the little girl is moving the fastest.

• Josh says that the little girl has more potential energy at point A because potential energy is greater when the height of the object is greater.

Tags

NGSS.MS-PS3-2

The law of conservation of energy states that when one form of energy is converted into another,

• energy is created in the process.

• energy is destroyed in the process.

• no energy is destroyed in the process.

• some of the energy cannot be accounted for.

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

When an electric fan is running, most of the incoming electrical energy changes into which kind of energy?

• mechanical energy

• thermal energy

• radiant energy

• sound energy