Energy CFA Review

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What is Kinetic Energy?

Back

Kinetic Energy is the energy 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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What is the formula for calculating Kinetic Energy?

Back

KE = 1/2 mv², where KE is kinetic energy, m is mass in kilograms, and v is velocity in meters per second.

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What is Potential Energy?

Back

Potential Energy is the energy stored in an object due to its position or state. It can be gravitational, elastic, or chemical energy.

Front

What is the formula for calculating Potential Energy?

Back

PE = mgh, where PE is potential energy, m is mass in kilograms, g is the acceleration due to gravity (9.81 m/s²), and h is height in meters.

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What is the relationship between mass and Kinetic Energy?

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Kinetic Energy is directly proportional to mass. If the mass of an object increases, its kinetic energy increases if the velocity remains constant.

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What is the relationship between velocity and Kinetic Energy?

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Kinetic Energy is proportional to the square of the velocity. If the velocity doubles, the kinetic energy increases by a factor of four.

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What is an example of energy as the ability to perform work?

Back

A battery powering a toy car demonstrates energy as the ability to perform work, as it enables the car to move.

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What type of energy is stored in a stretched rubber band?

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A stretched rubber band stores Potential Energy due to its position and tension.

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How do you calculate the Kinetic Energy of a 1.5 kg soccer ball rolling at 5 m/s?

Back

KE = 1/2 mv² = 1/2 (1.5 kg)(5 m/s)² = 18.75 J.

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What is the Kinetic Energy of a 3 kg skateboarder moving at 2.5 m/s?

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KE = 1/2 mv² = 1/2 (3 kg)(2.5 m/s)² = 9.4 J.