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Potential and Kinetic Energy Overview

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Questions and Answers

Which method will NOT increase the gravitational potential energy of an object?

Changing the object to a different material
Increasing the mass of the object
Decreasing the mass of the object (correct)
Increasing the height of the object

What is the formula used to calculate kinetic energy?

KE = m * v²
KE = ½ * m * v
KE = m * g * h
KE = ½ * m * v² (correct)

If a 4 kg ball is moving at 5 m/s, what is its kinetic energy?

10 J
50 J (correct)
20 J
25 J

How does doubling the mass of an object affect its kinetic energy if the speed remains the same?

<p>Kinetic energy doubles (C)</p> Signup and view all the answers

Which of the following is NOT an example of a force that acts without physical contact?

<p>Frictional force (C)</p> Signup and view all the answers

Flashcards

Gravitational Potential Energy (GPE)

The energy stored in an object due to its position above the ground.

Increasing GPE

You can increase an object's GPE by increasing its height or its mass.

Kinetic Energy (KE)

The energy an object possesses due to its motion.

KE and Mass

Kinetic energy increases linearly with the mass of the object, keeping speed constant.

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KE and Speed

Kinetic energy increases with the square of the object's speed, keeping mass constant.

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Study Notes

Potential and Kinetic Energy

Force can be exerted without contact (e.g., gravity, electric, magnetic fields)
To increase gravitational potential energy (GPE), either increase the height or mass
GPE calculation: GPE = mgh (mass x gravity x height)
Example: GPE of a 3kg book 2m above the ground (assuming gravity 9.8m/s²): 58.8J

Kinetic Energy

Kinetic energy (KE) depends on mass and speed
KE calculation: KE = ½mv² (half x mass x speed²)
Graph A shows speed effect on KE
Graph B shows mass effect on KE
Example: KE of a 4kg ball traveling 5 m/s: 50 J
Doubling the mass of the 8kg ball while keeping the speed the same results in double the kinetic energy: 100 J

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Description

This quiz explores the concepts of potential and kinetic energy, including their definitions, calculations, and examples. It covers factors affecting gravitational potential energy as well as the relationship between mass, speed, and kinetic energy. Test your understanding of these fundamental physics principles!