Conservation of Energy

Front

What is the definition of gravitational potential energy?

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

Front

How do you calculate gravitational potential energy?

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Gravitational potential energy (PE) is calculated using the formula: PE = mgh, where m is mass (in kg), g is the acceleration due to gravity (approximately 9.81 m/s² on Earth), and h is height (in meters) above a reference point.

Front

What is kinetic energy?

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Kinetic energy is the energy an object has 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 the increase in kinetic energy when speed changes?

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The increase in kinetic energy can be calculated by finding the difference between the final kinetic energy and the initial kinetic energy using the formula: KE increase = KE(final) - KE(initial).

Front

What is the principle of conservation of energy?

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The principle 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 happens to gravitational potential energy as an object falls?

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As an object falls, its gravitational potential energy decreases while its kinetic energy increases, keeping the total mechanical energy (potential + kinetic) constant in the absence of air resistance.

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What is the relationship between kinetic energy and gravitational potential energy during free fall?

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During free fall, the gravitational potential energy lost by an object is converted into kinetic energy, maintaining the total energy constant.

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How does height affect gravitational potential energy?

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Gravitational potential energy increases with height; the higher an object is positioned, the greater its potential energy due to the increased distance from the ground.

Front

What is the significance of the reference point in calculating potential energy?

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The reference point is crucial in calculating potential energy because it determines the height (h) used in the formula PE = mgh; different reference points can yield different potential energy values.

Front

What is the formula for calculating the total mechanical energy of an object?

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The total mechanical energy (E) of an object is the sum of its kinetic energy (KE) and gravitational potential energy (PE): E = KE + PE.