Question 43

Thermal energy is the primary type of energy described when a furnace warms the air in a house.

When a furnace operates, it generates heat that raises the temperature of the air circulating within the home, which is classified as thermal energy.

A) Kinetic

Kinetic energy refers to the energy possessed by an object due to its motion. While the movement of air may involve kinetic energy, it is not the primary type of energy involved when a furnace warms air; rather, it is the heat produced by the furnace that is significant.

B) Gravitational potential

Gravitational potential energy is the energy stored in an object as it is raised above the ground, dependent on its height and mass. This type of energy is not relevant to the process of a furnace warming air, as it does not involve elevation or potential energy changes associated with gravity.

C) Thermal

Thermal energy is the energy that comes from the temperature of matter. When a furnace heats the air, it transfers thermal energy to the air, increasing its temperature and thus making this the correct answer.

D) Elastic potential

Elastic potential energy is the energy stored in elastic materials as the result of their stretching or compressing. This type of energy does not apply to the heating of air by a furnace, as the process does not involve any elastic deformation or storage of energy in that manner.

Conclusion

Thermal energy is the key form of energy involved in the heating process of air by a furnace, as it directly relates to the heat generated and transferred. Other options, such as kinetic, gravitational potential, and elastic potential energies, do not accurately describe the energy type associated with the heating of air, reinforcing that thermal energy is the primary focus in this context.