Temperature and Heat

Which is the best example of conduction?

• Ocean currents moving from warm oceans to cooler oceans.

• Getting a sun tan by the pool.

• Food sitting under a light at a restaurant to keep it warm.

• Bacon cooking in a frying pan.

Which is the best example of convection?

• Heat from a space heater rising to the ceiling while the cooler air in the room sinks.

• Butter melting on a stack of pancakes.

• A spoon feels hot because it was sitting in a bowl of soup.

• Toast burning in a toaster.

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NGSS.MS-PS3-4

Which is the best example of radiation?

• A hotdog cooking in a fryer.

• Noodles floating and sinking in a pot of boiling soup.

• The earth getting heat from the sun.

• An egg boiling in a pot of water.

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Convection's circular movement is caused by heat changing the density of

• a liquid or gas

• gas only

• liquid only

• a solid

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Thermal contraction occurs when which of the following happens?

• Molecules slow down and move apart together

• Molecules seed up and move closer together

• Molecules slow down and move closer together

• Molecules heat up

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NGSS.MS-PS1-4

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What happens to the temperature of an object when the particles are moving faster?

• reduces

• increases

• remains constant

• increases then reduces

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NGSS.MS-PS1-4

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The natural direction of heat flow between two bodies depends on __________.

• their volume

• their temperature

• their heat capacity

• whether they are in a liquid, a solid or gaseous state

The decrease in temperature of a substance indicates that the _______.

• A. number of particles in it decreases

• B. average velocity of its particles increases

• C. average potential energy of particles decreases

• D. average kinetic energy of its particles decreases

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NGSS.MS-PS1-4

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What average energy of particles does temperature measure?

• A. chemical

• B. kinetic

• C. mechanical

• D. potential

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NGSS.MS-PS1-4

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Do all particles of the substance at a certain temperature move at the same speed and in the same direction?

• No

• Yes

• Maybe

• None of the above

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