2nd Semester Finals Review

Which of the following best defines the Law of Conservation of Energy?

• Energy can be created and destroyed.

• Energy cannot be created or destroyed; it can only be transformed.

• Energy is always lost as heat.

• Energy is only present in moving objects.

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NGSS.HS-PS3-2

NGSS.HS-PS1-4

NGSS.HS-PS3-4

What is the unit of measurement for kinetic energy?

• Newtons (N)

• Joules (J)

• Watts (W)

• Meters (m)

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NGSS.HS-PS3-2

When is the skateboarder’s kinetic energy (KE) greatest?

• At the highest point of the ramp

• At the lowest point of the ramp

• When the skateboarder starts

• When the skateboarder stops

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NGSS.MS-PS3-1

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What happens to the kinetic energy as an apple falls from a tree?

• It decreases

• It stays the same

• It increases

• It disappears

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NGSS.HS-PS3-2

If you push on a wall with as much force as you can, why is no work done?

• The wall moves

• There is no force applied

• There is no displacement

• The wall absorbs the energy

What is the unit of measurement for power?

• Joules (J)

• Watts (W)

• Newtons (N)

• Meters (m)

What happens to the potential energy when an apple falls from a tree?

• It increases

• It stays the same

• It decreases

• It disappears

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NGSS.MS-PS3-2

NGSS.MS-PS2-4

Assuming there is no friction, what is the kinetic energy of a motorcycle rider approaching a hill at a speed of 15 m/s, with a combined mass of 280 kg?

• 31,500 J

• 2,100 J

• 28,000 J

• 15,750 J

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NGSS.HS-PS3-1

If all the kinetic energy is transferred to potential energy at the top of the hill, what will the height be when the bike comes to rest? Remember the kinetic energy of the bike is 31500 J and the mass is 280 kg. (Assume g = 9.8 m/s²)

• 11.4 m

• 31.5 m

• 45.0 m

• 10.0 m

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NGSS.HS-PS3-1

What is the skier’s potential energy at the top of a 45 m hill if the skier’s mass is 75 kg? (Assume g = 9.8 m/s²)

• 33,075 J

• 3,375 J

• 45,000 J

• 7,350 J

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NGSS.HS-PS3-1