Heat Transfer Retest

​Heat Transfer

By STEPHANIE M HENZE

Heat

the energy transferred from an object at a higher temperature to an object at a lower temperature.

Heat Transfer

HOT --> COLD!!!

Heat transfers from a hotter material to a colder one.

The faster the particles are moving, the more thermal and kinetic energy they have (the hotter the material is)

Multiple Choice

How does heat transfer?

• Hot to cold

• Cold to hot

Multiple Select

Which of the following are good conductors? (select all that apply)

• Copper

• Plastic

• Wood

• Steel

Multiple Choice

Which statement is true?

• The quicker a molecule moves, the colder it is.

• The slower a molecule moves, the warmer it is.

• The quicker a molecule moves, the warmer it is

• The movement of molecules don't affect temperature

Multiple Choice

Heat transfers from an area of ____temperature to an area of ___ temperature.

• high to low
• low to high
• high to high
• It can travel high to low and low to high. 

Radiation

• The transfer of energy by electromagnetic waves.

• Radiation is absorbed by matter and converted to heat energy.

• Does not always require matter in order to move.

Multiple Choice

Name the type of heat transfer going to the fries.

• Conduction

• Convection

• Radiation

Conduction

• the transfer of heat from one object to another through direct contact (touching) of matter.

• •Conduction occurs primarily in solids because the particles are tightly packed together.

Conduction

through DIRECT CONTACT!

• conductor: transfers heat well (metal)

• insulator: does not transfer heat well (wood, plastic, etc.)

Convection

• the transfer of thermal energy (heat) through the movement of liquids and gases.

• Convection occurs in FLUIDS (liquids and gases).

• Convection produces CURRENTS in both gases and liquids.

Convection

-by the movement of a fluid (liquid or gas).

When a fluid is:
- HEATED its particles SPEED UP and move APART, making it LESS dense and RISE.

-COOLED its particles SLOW DOWN and move TOGETHER, making it MORE dense and SINK.

This creates a CONVECTION CURRENT transferring heat throughout the fluid.

Multiple Choice

What is the definition of CONVECTION

• When heat transfers through waves.

• When heat transfers from objects that are touching.

• a hot liquid or air that expands, becomes less dense, and rises or becomes more dense, and sinks.

• Heat traveling from the sun

Multiple Choice

Jeffery brings a book from air-conditioned apartment to a balcony on a hot summer day. How will the cool book interact with the outside air?

• Heat from the book will move to the air.

• Heat from the air will move to the book.

• Coolness from the book will move to the air.

• Coolness from the air will move to the book.

Multiple Choice

A house burns down. The vinyl siding of the house next door warps due to

• conduction
• convection
• radiation

Multiple Choice

When you use a microwave, what is the main way that heat is transferred?

• Convection
• Conduction
• Radiation
• insulation.

Multiple Choice

The candle will slowly heat the metal and transfer the heat directly to the mans hand.

• conduction
• convection
• radiation

Multiple Choice

Jesse is walking on the sand at the beach one summer day. If heat is not flowing between her feet and the sand, which of the following must be true?

• The sand is wet.

• The sand is too cold for heat to flow.

• The sand is the same temperature as her feet.

• There is no friction between her feet and the sand.

Multiple Choice

A chair is placed several feet from a fireplace.  The fireplace has a glass screen.  The side of the chair facing the fireplace gets warm because of 

• conduction
• convection
• radiation

Multiple Choice

Conduction is heat transfer by -

• Touch
• Circles
• Waves

Multiple Choice

Movements of water in a pot, molten mantle in the earth's crust and hot air rising in the atmosphere are examples of

• Sublimation

• Convection

• Conduction

• Radiation

Multiple Choice

Your best friend has a bunk bed. You move from the bottom bunk to the top bunk and notice that the air is warmer. The warm air rises because of _?_.

• conduction
• convection
• radiation

Multiple Choice

You are in science class and want to see if the hot plates were used recently. You place your hand near the side of the hot plate. Without touching the hot plate, your hand feels warmer. Heat is transferred to your hand by _?_.

• conduction

• convection

• radiation

Multiple Choice

A huge rock at the state park gets hot during the day. The rock was warmed from the Sun by

• conduction
• convection
• radiation

Multiple Choice

Which of the following is the best example of conduction?

• A light bulb warming a lampshade
• An egg cooking in a frying pan
• Water boiling in a pot
• Gases circulating in the atmosphere

Multiple Choice

The kind of heat transfer that travels through space in electromagnetic waves is ______________________.

• insulation.
• Radiation
• Conduction
• Convection

Multiple Choice

In a swimming pool, water near the surface is slightly warmer. The warm water rises because of

• conduction
• convection
• radiation