energy and heat review

Front

What is conduction?

Back

Conduction is the transfer of thermal energy through direct contact between materials. It occurs when heat moves from a hotter object to a cooler one through molecular collisions.

Front

What is convection?

Back

Convection is the transfer of thermal energy through the movement of fluids (liquids or gases). It occurs when warmer, less dense fluid rises and cooler, denser fluid sinks, creating a circulation pattern.

Front

What is radiation?

Back

Radiation is the transfer of energy through electromagnetic waves. It does not require a medium to travel, allowing heat from the Sun to reach Earth.

Front

What is thermal energy?

Back

Thermal energy is the total kinetic energy of particles in a substance. It is related to temperature and the state of matter.

Front

What is the role of insulation in thermal energy transfer?

Back

Insulation reduces the rate of heat transfer between objects or environments, helping to maintain temperature by minimizing conduction, convection, and radiation.

Front

How does heat transfer occur when walking barefoot on hot asphalt?

Back

Heat transfer occurs through conduction, as the heat from the asphalt directly contacts the skin of the foot.

Front

What is the difference between conduction and convection?

Back

Conduction involves direct contact between materials for heat transfer, while convection involves the movement of fluids to transfer heat.

Front

What is an example of radiation in everyday life?

Back

An example of radiation is feeling warmth from the Sun on your skin, even when standing in the shade.

Front

What is required for conduction to occur?

Back

Conduction requires direct contact between materials; heat cannot be transferred through empty space.

Front

What happens to particles in a fluid during convection?

Back

In convection, warmer particles become less dense and rise, while cooler particles become denser and sink, creating a circulation pattern.