Energy Unit, part 1, I Cans 3, 4, 5

What does the Law of Conservation of Energy mean?

• The amount of energy remains the same even when energy is transferred out or into a system or transformed to a different form.

• The amount of energy changes only in an open system.

• The amount of energy changes in an isolated system.

• Energy can not ever be created but can be destroyed in an open or closed system.

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

Which system below is considered an open system?

• a glass

• a jar with a lid

• a vacuum in space

• a metal box with no opening

Which system(s) below is considered an closed system?

• a glass

• a jar with a lid

• a vacuum in space

• a metal box with no opening

Two forces that allow energy to transfer and transform in and out of systems on Earth are ​ friction, a force that slows down an object's movement and _______ , a large pulling force between Earth and objects close to it.

Tags

NGSS.HS-PS2-4

Select a true statement about isolated systems.

• Only matter can flow in an out, not energy.

• Matter and energy can flow in and out.

• There are none currently located on Earth.

• Only energy can flow in and out, not matter

The only type of system that doesn't allow energy to dissipate is...

• open

• isolated

• closed

• none of these

Dissipation is...

• a movement of any energy from one place to another

• the total energy an object possesses

• a combination of KE and PE

• The transfer of a form of KE out of a system.

Tags

NGSS.HS-PS3-4

The most common forms of energy that dissipate to the environment is...

• sound

• electrical

• electromagnetic

• thermal

Tags

NGSS.HS-PS3-4

The mechanical energy within an open or closed system remains the same.

• True

• False