Understanding Mechanical Energy Concepts (38)

What does the principle of Conservation of Energy state about the total mechanical energy of a roller coaster car if air resistance and friction are ignored?

• It increases as the car moves.

• It remains constant.

• It decreases as the car moves.

• It doubles at the highest point.

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NGSS.MS-PS3-5

What is total mechanical energy (TME) the sum of?

• Only kinetic energy

• Only potential energy

• Kinetic and potential energies

• Heat and sound energy

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NGSS.MS-PS3-4

What is the formula for gravitational potential energy (GPE)?

What is the formula for kinetic energy (KE)?

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If a roller coaster car has 100,000 J of GPE and 20,000 J of KE at point A, what is its total mechanical energy (TME) at point A?

• 80,000 J

• 120,000 J

• 20,000 J

• 100,000 J

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

A cyclist and his bike have a total mechanical energy of 500 J, and their potential energy is 200 J. What is their kinetic energy?

• 700 J

• 300 J

• 200 J

• 500 J

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which of the following best describes energy transformation in a roller coaster?

• Only kinetic energy is present throughout the ride.

• Potential energy is converted to kinetic energy and vice versa.

• Energy is lost and not conserved.

• Only potential energy is present throughout the ride.

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If a 3 kg brown pelican is flying at 10 m/s at a height of 15 meters, what is the formula to calculate its total mechanical energy?

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NGSS.MS-PS3-4

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NGSS.MS-PS3-1

If the total mechanical energy of a system is 800 J and the kinetic energy is 500 J, what is the potential energy?

• 300 J

• 1,300 J

• 500 J

• 800 J

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NGSS.MS-PS3-2

A roller coaster car starts at rest at the top of a hill with 150,000 J of potential energy. What is its kinetic energy at the top?

• 0 J

• 75,000 J

• 150,000 J

• 300,000 J

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NGSS.MS-PS3-5

NGSS.MS-PS3-2