Conservation of Energy and Energy Transformation

The Law of Conservation of Energy states:

• Energy can created or destroyed but not transformed 

• Energy cannot be created or destroyed, it can only transformed

• Energy can't be created, destroyed or transformed

Tags

NGSS.MS-PS3-5

According to the Law of Conservation of energy, the amount of energy before and after a reaction must be the same. Which statement below is true?

• The total amount of energy is conserved

• The total amount of energy is less after a reaction

• The total amount of energy is more after a reaction

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

The hand generator works by turning the handle which lights up the bulb. What energy transformation occurs as the handle is turned?

• Thermal to electrical

• Electrical to mechanical

• Mechanical to electrical to light

• Light to electrical

Maria’s father started a fire in the fireplace. He crumpled some paper, lit a match, and soon the logs in the fireplace were burning. In this case, the stored chemical energy in the logs was changed into

• electrical energy.

• mechanical motion.

• heat and light energy.

• electrical and heat energy.

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NGSS.MS-PS3-4

When energy enters a system and then comes out of the system later, the law of conservation of energy states that–

• some of the energy that entered the system will remain in the system.

• the energy will always create a change in the properties of the parts of the system.

• the form of energy that comes out of the system must be the same form that entered.

• the amount of energy coming out of the system must equal the energy that entered the system.

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

In energy transformations, "wasted energy" usually takes what form?

• heat

• chemical energy

• light

• sound waves

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

A teacher rubbed a match against a piece of sandpaper. The match started to burn. Which statement best describes the energy changes that occurred?

• The chemical energy stored in the match changed to thermal energy and light energy.

• The thermal energy stored in the match changed to light energy and chemical energy.

• The light energy and thermal energy stored in the match changed to mechanical energy.

• The light energy and thermal energy stored in the match changed to chemical energy.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which energy transformation below matches?
A book falling?

• chemical to sound and heat

• kinetic to sound and heat

• electrical to sound and heat

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Which is an example of a single energy transformation?

• A toaster converts electrical to thermal energy

• A match converts mechanical to thermal to electromagnetic

• A biker converts chemical to mechanical to thermal

• A car converts chemical to thermal to mechanical

What is an example of multiple energy transformations?

• Your body transforms chemical to thermal

• Your body transforms chemical to mechanical

• a flashlight converts chemical energy in batteries to electrical to electromagnetic energy in light

• a phone converts electrical to electromagnetic

Tags

NGSS.MS-PS3-5