Chapter 3 Test

How is work related to energy? (Check all that apply.)

• Energy is the ability to do work
  

• You expend energy when you do work

• When network is done on something it gains energy

Tags

NGSS.MS-PS3-5

What is the relationship between the work done while moving a book to a higher bookshelf and the change of potential energy?

• The increase equals the work done

• The potential energy increase is greater

• The work done is greater

• There is no relationship between work and potential energy

Tags

NGSS.MS-PS2-4

Does a person standing motionless in the aisle of a moving bus have kinetic energy from the perspective of an observer standing on the road?

• Yes, relative to the earth’s surface the person has velocity.

  
  

• No, the person is not moving.

  
  

• Yes, but kinetic energy does not always require motion.

  
  

• No, kinetic energy requires a velocity.

  
  

Tags

NGSS.MS-PS3-1

Which of the following does not require work to be done? An increase in

• potential energy

• kinetic energy

• a combination of potential energy and kinetic energy

• none of the above

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-3

How much energy is consumed in one minute by a 100 W bulb?

• 6000 J

  
  

• 600 J

  
  

• 100 J

  
  

• kJ

Is a kWh a unit of work, energy, power, or more than one of these? (Check all that apply.)

• It is a unit of work since W = Pt (from P = W/t).

  
  

• It is a unit of power since a watt is a power unit.

  
  

• It is a unit of energy since energy is the ability to do work.

  
  

• It is all of these since a watt is energy.

  
  

Tags

NGSS.MS-PS3-5

NGSS.MS-PS3-4

If energy cannot be destroyed, why do some people worry about the energy supply?

• It cannot be destroyed, but it cannot be created either.

  
  

• Most of our chemical supply is chemical, which is burned.

  
  

• Moving water is a renewable energy source.

  
  

• The concern is with usable sources of energy.

  
  

Tags

NGSS.MS-ESS3-4

A spring clamp exerts a force on a stack of papers it is holding together. Is the spring clamp doing work on the papers?

• No, work requires a force to move through a distance.

  
  

• Yes, the clamp exerts a force.

  
  

• No, the force of the spring is greater than the force of the papers.

  
  

• Yes, the papers are staying together.

  
  

Why are petroleum, natural gas, and coal called fossil fuels?

• They formed from organisms that lived millions of years ago.

  
  

• They are always found near deposits of fossils.

  
  

• This term means that the fuels have been used for a long, long time.

  
  

Tags

NGSS.MS-LS4-1

From time to time, people claim to have invented a machine that will run forever without energy input and develop more energy than it uses (perpetual motion). What is wrong with this claim?

• Energy forms cannot be converted to new forms.

  
  

• If it makes more energy than it uses it would explode.

  
  

• Nothing is wrong; it is a great invention.

  
  

• This violates the law of conservation of energy.

  
  

Tags

NGSS.MS-PS3-5