Chapter 6 - Energy, Work & Power

What is energy?

• The amount of matter stored in an object.

• The capacity to do work.

• The ability to make an object move.

• The product of the mass and the acceleration.

Which of the following is not a type of potential energy?

• Chemical potential energy

• Elastic potential energy

• Gravitational potential energy

• Electric potential energy

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NGSS.HS-PS2-4

The diagram shows a solar powered car. The solar cells on the car are connected to an electric motor which will move the car. Which of the following energy transformations best describes how the car is being moved?

• Wind energy → Electrical energy → Kinetic energy

• Nuclear energy → Electrical energy → Kinetic energy

• Solar energy → Electrical energy → Kinetic energy

• Elastic potential energy → Electrical energy → Kinetic energy

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NGSS.HS-PS3-3

A young girl wishes to select one of the frictionless playground slides illustrated below to give her the greatest loss in gravitational potential energy when she reaches the bottom of the slide.

Which of the slides illustrated in the diagram above should she choose?

• Slide A

• Slide B

• Slide C

• Same for all 3 slides

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NGSS.HS-PS3-1

Cheryl rolls a ball-bearing down a frictionless track. Ignoring air resistance, which is the furthest point it will reach before rolling backwards?

• A

• B

• C

• D

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NGSS.HS-PS2-1

What is work done?

• Product of force and the distance moved in the direction of force

• Product of force and the perpendicular distance moved

• Product of force and the vertical height moved

• Product of force and the speed of the object

Which of the examples shows that work is not done?

• Kicking a ball away

• Dragging a load across a floor

• Leaning against a concrete wall

• Throwing an object up in the air

What is power?

• The rate of work done

• The rate of speed change

• The rate of distance travelled

• The rate of force applied

In which of the following are all the units correct?

• MASS - kg

  Force - N

  Work - J

  Energy - W

  Power - W

• MASS - N

  Force - kg

  Work - J

  Energy - W

  Power - J

• MASS - kg

  Force - N

  Work - J

  Energy - J

  Power - W

• MASS - kg

  Force - J

  Work - N

  Energy - W

  Power - W

Lachmi pulls a loaded trolley from point P to point Q

• A

• B

• C

• D

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NGSS.HS-PS2-1