Two Truths and a Lie: Potential and Kinetic Energy

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or state. For example, a rock at the top of a hill has potential energy because of its height.

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What is kinetic energy?

Back

Kinetic energy is the energy of an object in motion. The faster an object moves, the more kinetic energy it has.

Front

How is potential energy converted to kinetic energy?

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Potential energy can be converted to kinetic energy when an object moves. For example, when a roller coaster descends from a height, its potential energy decreases while its kinetic energy increases.

Front

What is the formula for kinetic energy?

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The formula for kinetic energy (KE) is KE = 1/2 mv², where m is mass and v is velocity.

Front

What is the formula for potential energy?

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The formula for gravitational potential energy (PE) is PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

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What happens to energy in a closed system?

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In a closed system, energy is conserved. It can change forms (e.g., from potential to kinetic) but the total energy remains constant.

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What is an example of potential energy?

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An example of potential energy is a stretched rubber band. It has stored energy due to its position.

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What is an example of kinetic energy?

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An example of kinetic energy is a moving car. The car has energy because it is in motion.

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What is the relationship between potential and kinetic energy?

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Potential and kinetic energy are interrelated; as one increases, the other decreases in a closed system, such as a swinging pendulum.

Front

What is the unit of energy?

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The unit of energy is the Joule (J).