If you walk barefoot on hot asphalt, energy is transferred by which process?

• Convection

• Radiation

• Conduction

• Reflection

Throughout the day, Matthew and Mei measure the temperature of lake water as it is warmed by the sun. The following table shows their data at four different times.

At what time was the thermal energy of the lake water the greatest?

• 9 a.m.

• 11 a.m.

• 3 p.m.

• 5 p.m.

Tags

NGSS.MS-PS1-4

Kumar is studying how Earth is warmed by sunlight. The following illustration shows his model of the sun and Earth.

Which process is mostly responsible for warming the soil in Kumar’s model?

• Conduction between the lamp and the soil causes the soil to warm.

• Convection currents between the lamp and the soil cause the soil to warm.

• Expansion of particles in the soil causes the soil to warm.

• Radiation from the lamp reaches the soil and causes the soil to warm.

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Energy is transferred as heat between two objects of ___________ temperatures.

• differing

• same

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which direction is heat flowing in the picture?

• from the hand to the ice
• from the ice to the hand
• heat is not being transferred
• there is no way to tell

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

Which of the following is an example of heat transfer by conduction?

• sunlight hitting a floor

• an electric stove heating an iron pan

• a wood stove heating nearby objects

• an electric heater heating air, which rises and is replaced with cooler air

When one end of a short metal bar is heated, the opposite end will eventually become hot.

Which of the following processes transfers the heat through the bar?

• radiation

• convection

• conduction

• condensation

Compared to the particles in a hardened lava sample, the particles in a liquid lava sample

• are moving faster.

• are closer together.

• have less kinetic energy.

• have a lower temperature.

How do you know when the transfer of thermal energy has ended?

• It never ends.

• When one substance begins to boil.

• Both objects reach the same temperature.

• When you can measure the amount of heat.

Warm air molecules are faster than cool air molecules.

• True

• False