Kinetic and Potential Energy Practice and Types of Energy

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Kinetic Energy Formula

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KE = 0.5 * m * v^2

Answer explanation

The correct formula for kinetic energy (KE) is KE = 0.5 * m * v^2, where m is mass and v is velocity. This formula shows that kinetic energy is proportional to the mass and the square of the velocity.

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Translate to English: stretched rubber band

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stretched rubber band

Answer explanation

The correct choice, 'stretched rubber band', represents a state of potential energy, similar to the question's context. The other options do not convey the same concept of stored energy or tension.

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Mechanical energy

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Sum of potential and kinetic energy

Answer explanation

Mechanical energy is defined as the total energy in a system due to its motion (kinetic energy) and its position (potential energy). Thus, the correct choice is that mechanical energy is the sum of potential and kinetic energy.

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Potential Energy vs Kinetic Energy

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Potential energy: energy due to position; Kinetic energy: energy due to motion.

Answer explanation

The correct choice states that potential energy is energy due to position or state, while kinetic energy is energy due to motion. This accurately defines the two types of energy, distinguishing their characteristics.

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Types of Energy

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Kinetic, Potential, Thermal, Chemical, Nuclear, Electromagnetic, Sound

Answer explanation

The correct choice includes kinetic, potential, thermal, chemical, nuclear, electromagnetic, and sound energy, which are fundamental forms of energy. Other options mix types and sources, but this one accurately lists energy types.

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Unit of energy measurement

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Julios (J)

Answer explanation

The unit of measurement for energy is the Joule (J). Watts measure power, which is the rate of energy transfer, while volts measure electric potential. Therefore, the correct answer is Julios (J).

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Law of Conservation of Energy

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Energy cannot be created or destroyed, only transferred or transformed.

Answer explanation

The law of conservation of energy states that energy cannot be created or destroyed, only transferred or transformed. This means energy can change forms but the total amount remains constant.

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Example of energy transformation

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Car engine burning gasoline

Answer explanation

The car engine burning gasoline is a clear example of energy transformation, as it converts chemical energy from gasoline into mechanical energy to power the vehicle.

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Potential energy transformed to kinetic energy during free fall

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Kinetic energy

Answer explanation

As an object falls in a gravitational field, its gravitational potential energy is converted into kinetic energy, which is the energy of motion. Therefore, the correct answer is kinetic energy.

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Types: Chemical, Gravitational, Elastic

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Potential Energy

Answer explanation

Chemical, gravitational, and elastic energies are all forms of potential energy, which is stored energy based on position or configuration. Thus, the correct answer is potential energy.