Power and Energy Physics Quiz

Explain the concept of potential energy and give an example of its application.

• Potential energy is the energy that an object has due to its temperature. For example, a hot cup of coffee has potential energy because it can be converted into thermal energy.

• Potential energy is the energy that an object has due to its position or state. It is stored energy that can be converted into other forms of energy. For example, a stretched rubber band has potential energy because it can be released to do work.

• Potential energy is the energy that an object has due to its color. For example, a red ball has potential energy because it can be converted into light energy.

• Potential energy is the energy that an object has due to its speed. For example, a moving car has potential energy because it can be converted into kinetic energy.

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NGSS.MS-PS3-2

Describe the process of calculating power. Provide a formula and an example calculation.

• Power = Work / Time

• Power = Energy / Time

• Power = Force x Distance

• Power = Mass x Acceleration

What is kinetic energy? How is it different from potential energy?

• Kinetic energy is the energy of sound, while potential energy is the energy of light.

• Kinetic energy is the energy of rest, while potential energy is the energy of motion.

• Kinetic energy is the energy of motion, while potential energy is the energy of position or state.

• Kinetic energy is the energy of heat, while potential energy is the energy of electricity.

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NGSS.MS-PS3-1

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NGSS.MS-PS3-5

Explain the principle of energy conservation. Provide an example to illustrate this principle.

• The principle of energy conservation states that energy can be destroyed, for example, when a car crashes and the energy is lost.

• Energy conservation means that energy can be created out of nothing, for example, when a light bulb is turned on.

• When a ball is thrown into the air, its initial kinetic energy is converted into potential energy at the highest point of its trajectory, and then back into kinetic energy as it falls back down.

• When a ball is thrown into the air, its initial kinetic energy is converted into sound energy as it moves through the air.

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NGSS.MS-PS3-5

Calculate the power of a machine that does 500 joules of work in 10 seconds.

• 100 watts

• 250 watts

• 50 watts

• 75 watts

A car has a mass of 1000 kg and is traveling at a speed of 20 m/s. Calculate its kinetic energy.

• 200,000 joules

• 500,000 joules

• 100,000 joules

• 1,000,000 joules

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NGSS.MS-PS3-1

How does the potential energy of an object change as it moves higher or lower in a gravitational field?

• Remains the same at any height

• Increases when moving higher, decreases when moving lower

• Becomes zero at any height

• Decreases when moving higher, increases when moving lower

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NGSS.MS-PS3-2

If a light bulb uses 60 watts of power, how much energy does it consume in 5 hours?

• 300 watt-hours

• 420 watt-hours

• 240 watt-hours

• 360 watt-hours

What is the formula to calculate kinetic energy?

• KE = 1/2 * mass * velocity^2

• KE = mass * velocity

• KE = mass / velocity

• KE = mass + velocity

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NGSS.MS-PS3-1

Calculate the kinetic energy of an object with a mass of 5 kg and a velocity of 10 m/s.

• 250 joules

• 500 joules

• 100 joules

• 50 joules

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NGSS.MS-PS3-1

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