Heat transfers

Jacob put on a wool sweater to keep warm before he went outside in the cool weather. Why are many sweaters made of wool?

• wool is a great conductor

• wool is a great insulator

• wool is a poor insulator

• wool is a great metal

Answer explanation

One way to retain your own thermal energy on a cold day is to wear clothes that trap air

Tags

NGSS.MS-PS1-4

To keep from burning a hand on a pot handle, of which material should the handle be made?

• aluminum

• glass

• iron

• rubber

Answer explanation

You don't want to touch any hot metals with your bare hands. Using a rubber handle will not burn your hand, so its a great insulator.

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Which material is classified as an insulator?

• copper

• wood

• iron

• steel

Sheryl made a list of some materials that she thinks do not easily conduct heat. Which material did she list incorrectly?

• plastic

• Styrofoam

• wood

• copper

Answer explanation

Copper is a metal. It is a great conductor.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Why do railroad track have gaps between them?

• They need the space to ride on the tracks.

• The metal railroad tracks expand due to increased temperatures during the summer

• They need the space to build more tracks

• The gaps between help the train go faster

Tags

NGSS.MS-PS1-4

Tom wants to study heat transfer in different materials. He fills a plastic cup and a steel cup with 100 mL of cold water and places the cups outside in the Sun for 20 minutes. When Tom measures the temperature, he finds out that the water in the steel cup is 5 degrees warmer than the water in the plastic cup.

Which statement is the best conclusion from Tom’s activity?

• Both steel and plastic are good conductors of heat.

• Both steel and plastic are good insulators of heat.

• Plastic is a better conductor of heat than steel.

• Steel is a better conductor of heat than plastic.

Tags

NGSS.MS-PS3-4

Seals are found in extremely cold climates, and they have thick layers of fat below their skins. How do the layers of fat protect seals in cold climates?

• by conducting seals’ body heat to the surroundings

• by insulating seals’ body heat from the surroundings

• by allowing the cold from the surroundings to flow into the seals’ bodies

• by preventing the heat from the surroundings to flow into the seals’ bodies

Answer explanation

Insulators keep trap heat from escaping.

What is the term used to describe an object that allows heat to move through it and from one object to another by contact?

• an insulator

• a conductor

• a translator

• a convector

Why do people put insulation in their attics for the winter?

• to lose heat

• to keep heat

• to reduce noise

• to look better

Answer explanation

insulators trap the heat that's already inside the home.

Tags

NGSS.MS-PS3-3

Sunlight passes through the windows of a car and causes the car seats to get hot. Which type of heat transfer would this be?

• Conduction

• Radiation

• Convection

• heat

Answer explanation

Sunlight is indirectly heating up the seats.

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4