Chapter 7 Work, Energy, and Energy Resources

What has to happen when a force is exerted on an object for work to be done?

• the object moves
• the object stays still
• the object is heavy
• none of these

Tags

NGSS.MS-PS3-5

If you exert a force of 10.0 N to lift a box a distance of 3 m, how much work do you do?

• 30J

• 300 J

• 90 J

• 900 J

Tags

NGSS.MS-PS3-5

Work is defined by _____________.

• force times time

• force devided by time

• force times distance

• force divided by distance

What is the unit of work?

• Joule

• newton

• watt

• all of these

Tags

NGSS.HS-PS3-3

Which of the following statements is true according to the law of conservation of energy?

• Energy cannot be created.

• Energy cannot be destroyed.

• Energy can be converted from one form to another.

• all of these

Tags

NGSS.MS-PS3-5

An object’s gravitational potential energy is directly related to which of the following?

• its height relative to a reference level

• its mass

• acceleration due to gravity

• all of these

The energy of motion is called

• kinetic energy.

• potential energy.

• thermal energy.

• work.

Tags

NGSS.MS-PS3-1

Work is a transfer of

• energy

• force

• mass

• motion

Tags

NGSS.HS-PS3-1

In order for work to be done, what must be true?

• Force acts in the same direction as the distance traveled.
• Force and distance are in opposite directions.
• Force is greater than distance.
• Distance is greater than force.

When you carry an object, is work done on it?

• Yes, force is applied in the same direction as the distance it travels.
• No, force is applied in a different direction than distance traveled.