Physics New zealand level 1 ncea on heat Flashcards
(27 cards)
What is heat?
Heat is the energy transferred between objects due to a temperature difference.
True or False: Heat flows from a colder object to a hotter object.
False
What is the SI unit of heat?
Joule (J)
Fill in the blank: The process of heat transfer through direct contact is called __________.
conduction
What is convection?
Convection is the transfer of heat through the movement of fluids.
Which method of heat transfer does not require a medium?
Radiation
What is thermal equilibrium?
Thermal equilibrium is the state in which two objects in contact no longer transfer heat between them.
True or False: A good conductor of heat has high thermal conductivity.
True
What is specific heat capacity?
Specific heat capacity is the amount of heat required to raise the temperature of 1 kilogram of a substance by 1 degree Celsius.
Fill in the blank: The formula for calculating heat transfer is __________.
Q = mcΔT
What does the symbol ‘m’ represent in the heat transfer formula?
Mass of the substance
What does ‘ΔT’ represent in the heat transfer formula?
Change in temperature
What is latent heat?
Latent heat is the heat energy required to change the state of a substance without changing its temperature.
True or False: The latent heat of fusion is the heat required to convert a solid into a liquid.
True
What is the difference between heat and temperature?
Heat is the energy transferred, while temperature is a measure of the average kinetic energy of particles.
What are conductors?
Conductors are materials that allow heat to flow easily through them.
What are insulators?
Insulators are materials that do not conduct heat well.
Fill in the blank: The process of heat transfer in gases is primarily through __________.
convection
What is the principle of conservation of energy in relation to heat?
Energy cannot be created or destroyed, only transformed from one form to another.
True or False: All materials have the same specific heat capacity.
False
What is thermal conductivity?
Thermal conductivity is a measure of a material’s ability to conduct heat.
What is the relationship between temperature and kinetic energy?
As temperature increases, the average kinetic energy of the particles in a substance increases.
Fill in the blank: In a vacuum, heat is transferred by __________.
radiation
What happens to the molecules of a substance when it is heated?
The molecules move faster and may spread apart.
