Lower Sec Science - Heat Answering Technique

16 Sep

Answering Technique for Conduction: Material X is a metal (State the material depending on question). Metals are good conductors of thermal energy. Thermal energy will be transferred efficiently from _____ through _____ to ______. Material Y is a plastic/ wood (State the material depending on the question). Plastics are poor conductors of thermal energy. Thermal energy will be transferred inefficiently from ____ through _____ to _____.
For questions on expansion:
_____ gains thermal energy from the _____ by _______. As the atoms at that end gain thermal energy, they move faster (increase in kinetic energy) and move further away from each other.

For questions on transfer of heat from one end of the object to the other end: _____ gains thermal energy from _____ by _______. As the atoms at the hotter end gain thermal energy, some of the thermal energy is converted to kinetic energy. The atoms vibrate faster and collide with neighbouring atoms and transfer the thermal energy to them. This process is repeated, allowing thermal energy to be transferred from one end of the object to the other.

Answering Technique for Radiation: Usage of black paint coating instead of other colours
_____ is a good absorber/emitter of thermal energy transmitted by radiation._____ will absorb/emit more thermal radiation than _____.Therefore, the _____ will gain/lose thermal energy faster, causing the _____ to become hotter/cooler than _____.

Note: if the question is on radiation, do not use the word “conductor”. Use “absorber” or “emitter” instead

Heat Practice Questions: