Energy Review

Front

What is kinetic energy?

Back

Kinetic energy is the energy that an object possesses due to its motion. It is calculated using the formula KE = 1/2 mv², where m is mass and v is velocity.

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Front

What is gravitational potential energy?

Back

Gravitational potential energy is the energy an object possesses due to its position in a gravitational field, typically calculated using the formula PE = mgh, where m is mass, g is the acceleration due to gravity, and h is height.

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Front

How do you calculate the gravitational potential energy of a 50 kg object lifted to a height of 20 m?

Back

Using the formula PE = mgh, where m = 50 kg, g = 9.8 m/s², and h = 20 m, the gravitational potential energy is PE = 50 kg * 9.8 m/s² * 20 m = 9800 J.

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Front

What happens to kinetic energy when an object is lifted to a height?

Back

When an object is lifted, its kinetic energy decreases as it gains gravitational potential energy.

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Front

What happens to gravitational potential energy when an object falls?

Back

As an object falls, its gravitational potential energy decreases while its kinetic energy increases.

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Front

What is the relationship between kinetic energy and potential energy in a closed system?

Back

In a closed system, the total mechanical energy (kinetic energy + potential energy) remains constant, assuming no external forces do work on the system.

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Front

What is the formula for kinetic energy?

Back

The formula for kinetic energy is KE = 1/2 mv², where m is the mass of the object and v is its velocity.

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Front

What is the formula for gravitational potential energy?

Back

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

Front

At which point does an object have the most kinetic energy during its motion?

Back

An object has the most kinetic energy at the lowest point of its motion, where its speed is highest.

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Front

At which point does an object have no potential energy?

Back

An object has no potential energy at the lowest point of its motion, where its height is zero.

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