Work, Power, Energy Review

 The law of conservation of energy states that when one form of energy is converted into another,

• Energy is destroyed in the process
• Energy is created in the process
• No energy is destroyed in the process
• Energy is lost in the process

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which energy-conversion process occurs whenever coal is burned at a power station?

• chemical to nuclear
• chemical to sound
• chemical to electrical
• mechanical to electrical

The energy associated with motion is called

• Kinetic energy
• Elastic potential energy
• Gravitational potential energy
• Nuclear energy

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NGSS.MS-PS3-1

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Light is an example of _________

• thermal energy
• radiant energy
• mechanical energy
• nuclear energy

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NGSS.MS-PS4-2

When you rub your hands together on a cold day, you use friction to convert

• Mechanical energy into thermal energy
• Thermal energy into nuclear energy
• Nuclear energy into electrical energy.
• Electrical energy into radiant energy

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NGSS.MS-PS3-5

Which of the following is defined as work done per unit time?

• A. energy

• B. force

• C. power

• D. work

50 J of work is done lifting a 2.0 kg book in the air. How high was it lifted?

• 2.6 m

• 3.6 m

• 1.0 m

• 25 m

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

How much energy is expended when a 10.0 kg box is moved 2.0 m?

• 20.0 J

• 5.0 J

• 0.20 J

• 2.5 J

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NGSS.MS-PS3-5

What are two things required for work to be done? Check all that apply.

• Force

• Distance

• Constant Speed

• Momentum

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NGSS.MS-PS3-5

How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?

• 15 J
• 45 J
• 0 J
• 5 J