DC -- Conservation of Energy

According to the Law of Conservation of Energy, "Total energy is constant in any process. It may change in form or ________, but the total remains the same."

• differ in the initial and final total

• be measured using variable units

• change the units of measurement

• be transferred from one system to another

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Which term represents all other forms of energy not included in mechanical energy or nonconservative forces?

• OE

• KE + PE

• Wnc

• =

The oxidation of food when a person eats is considered which type of energy?

• OE

• KE

• PE

• W_nc

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NGSS.HS-LS1-7

Which type of energy is obtained by converting small amounts of mass into useable energy?

• nuclear

• electrical

• kinetic

• gravitational

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What type of machine is pictured in the reading as an example of solar energy being converted into electrical energy?

• 
• 
• 
• 

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The output of useful energy or work as a result of an energy conversion process is known as

• Conservation

• Thermal conversion

• Efficiency

• Mechanics

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NGSS.HS-PS3-3

In a coal-fired power plant, about 40% of the chemical energy in the coal becomes useful electrical energy. What happens to the other 60%?

• transformed into kinetic energy

• stored in batteries

• captured by transformers and used in motors

• released to the environment as heat

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NGSS.HS-PS3-4

When only conservative forces are involved, the work-energy theorem states that the net work done by all forces acting on a system equals its ---

• change in displacement.

• change in negative work done.

• change in nonconservative forces.

• change in kinetic energy.

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The total kinetic plus potential energy of a system is defined to be its ---

• total net force applied.

• nonconservative forces.

• total mechanical energy.

• total mechanical efficiency.

The car in the diagram has the same starting velocity when it takes path A and path B. Which path will give it the greatest final velocity when it reaches point X?

• path A

• path B

• both paths give the same final velocity

• impossible to determine without knowing the spring constant

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NGSS.HS-PS3-1

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