Unit 4: Thermal Energy (I.6C & I.6D)

A system in which the total amount of energy remains constant as energy conversions occur

• Open System

• Closed System

• Mechanical System

• Weather System

Which of the following displays an open system?

• The first

• The second

• The third

• None

Tags

NGSS.MS-PS3-3

A battery is connected to a closed circuit. As the electrons flow, chemical energy is converted to light and heat energy when passing through resistors. Which of the following remains constant?

• electrical energy

• chemical energy

• light energy

• total amount of energy

Tags

NGSS.HS-PS3-4

Two objects are placed against one another in a closed system. One object is 75 C and the other is 50 C. What way will heat flow to reach thermal equilibrium?

• Each object will maintain it's own heat in a closed system

• The heat will flow from the object that is 50 C to the object that is 75 C

• The heat will flow from the object that is 75 C to the object that is 50 C

• The heat will flow in both directions

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

A student places coffee in two insulated mugs: one with a lid, the other without. Which mug is most likely the open system?

• Mug 1

• Mug 2

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Many thermal power plants work by burning coal (chemical energy) to produce steam or heat (thermal energy). That energy rises and spins a turbine (mechanical energy) that is attached to a large magnet which spins in side a coil of wire. This creates electric energy. Which is true about the total amount of energy in the system?

• It varies by conversion

• it remains constant

• it decreases with each conversion

• it increases with each conversion

Tags

NGSS.HS-PS3-3

NGSS.HS-PS3-4

NGSS.HS-PS3-5

Which type of energy is released when water vapor condenses to form condensation (liquid)

• Thermal

• hydro

• mechanical

• light

Tags

NGSS.MS-ESS2-4

In a mechanical system, lubrication improves efficiency by...

• reducing mechanical energy used

• increasing mechanical energy used

• reducing energy lost to heat from friction

• increasing the thermal energy used

In a mechanical system, increasing friction is a problem because

• it increases the chances of it breaking or stopping the system

• More energy is lost to heat

• It decreases resistance

• It decreases heat used

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-5

Ice cream shops often place scoops in hot water before scooping the ice cream. Describe the thermal energies of the ice cream and scoop when the server scoops ice cream for a client.

• The ice cream and scoop increase in thermal energy

• The ice cream and scoop decrease in thermal energy

• The ice cream increases in thermal energy and the scoop decreases in thermal energy

• The ice cream decreases in thermal energy and the scoop increases in thermal energy.

Tags

NGSS.MS-PS1-4