Energy Calculations Review

When an object is in motion, it has ___________ energy.

• potential
• mechanical
• kinetic
• movement

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Gravitational potential energy depends on the ________ and ________ of the object. 

• Height and mass
• Friction and movement
• Mass and Movement
• Height and Friction 

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Explain what happens to the potential energy of a rock as it falls off the side of a cliff.

• The kinetic energy decreases as the potential energy increases.
• The kinetic energy decreases as the potential energy decreases.
• The potential energy decreases as the kinetic energy increases.
• The potential energy decreases as the kinetic energy decreases. 

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Lilly's cat ran through your yard. The cat has a mass of 5 kg. He is running at a speed of 3 m/s. What is the kinetic energy of the cat as he runs?

• 8.5 J

• 45 J

• 7.5 J

• 22.5 J

Tags

NGSS.MS-PS3-1

Which has the most kinetic energy?

• a basketball rolling down a hill
• a bus stopped at the top of a hill
• a dump truck driving down a hill
• a golf ball sitting at the top of the hill

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What does the Law of Conservation of Energy state?

• Energy cannot be created or destroyed
• Nothing can exchange energy
• Energy will increase over time.
• Energy will decrease over time.

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NGSS.MS-PS3-5

What force ultimately slows the roller coaster to a stop?

• Applied
• Normal
• Friction
• Magnetic

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What is the correct unit for energy?

• meters (m)

• kilogram meters per second (kg m/s)

• Newtons (N)

• Joules (J)

What is the mass of a ball that has a kinetic energy of 115 J and is traveling at 9 m/s?

• 1035 kg

• 23.5 kg

• 12.8 kg

• 2.84 kg

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NGSS.MS-PS3-1

At the top of a ramp, a toy car (at rest) has an Eg of 86 J. At the bottom of the ramp (height = 0 m), the car has an Ek of 50 J. How much energy was lost to thermal?

• 136J

• 36J

• 50J

• 5J

Tags

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