Energy Calculations

Front

What is kinetic energy?

Back

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

Front

How do you calculate kinetic energy?

Back

Kinetic energy (KE) is calculated using the formula KE = 1/2 mv², where m is the mass of the object in kilograms and v is its velocity in meters per second.

Front

What is potential energy?

Back

Potential energy is the energy stored in an object due to its position or state, often associated with gravitational potential energy (GPE) which is calculated as GPE = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Front

How do you calculate gravitational potential energy?

Back

Gravitational potential energy (GPE) is calculated using the formula GPE = mgh, where m is mass in kilograms, g is the acceleration due to gravity (approximately 9.81 m/s²), and h is height in meters.

Front

What is the law of conservation of energy?

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The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another, meaning the total energy in a closed system remains constant.

Front

What is the unit of energy?

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The unit of energy is the Joule (J).

Front

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

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In a closed system, the total mechanical energy (kinetic + potential) remains constant, meaning that as potential energy decreases, kinetic energy increases, and vice versa.

Front

What is an example of kinetic energy?

Back

A moving car or a marble rolling down a ramp are examples of kinetic energy.

Front

What is an example of potential energy?

Back

A stretched rubber band or a book on a shelf are examples of potential energy.

Front

If an object has a mass of 0.3 kg and is moving at 6 m/s, what is its kinetic energy?

Back

The kinetic energy is 5.4 J, calculated using KE = 1/2 mv².