Phy 2 Flashcards
What is energy transfer by heating?
The transfer of thermal energy from one object to another due to a temperature difference.
True or False: Heat is a form of energy.
True
Fill in the blank: Heat always flows from a ______ object to a ______ object.
hot; cold
What is conduction?
The transfer of heat through a solid material without the movement of the material itself.
Which method of heat transfer occurs in fluids?
Convection
True or False: Radiation requires a medium to transfer heat.
False
What is convection?
The transfer of heat through the movement of fluids (liquids or gases).
What is the primary method of heat transfer from the sun to the Earth?
Radiation
Multiple Choice: Which of the following is NOT a method of heat transfer? A) Conduction B) Convection C) Reflection D) Radiation
C) Reflection
What is thermal conductivity?
A measure of a material’s ability to conduct heat.
Fill in the blank: The unit of heat energy is the ______.
Joule
What is the term for the amount of heat required to raise the temperature of a unit mass of a substance by one degree Celsius?
Specific heat capacity
True or False: Metals generally have higher thermal conductivity than non-metals.
True
What is the primary factor that affects heat transfer by conduction?
Temperature difference
Multiple Choice: Which of the following materials would be a good insulator? A) Copper B) Wood C) Aluminum D) Iron
B) Wood
What happens to the particles in a substance when it is heated?
They gain energy and move faster.
Fill in the blank: The transfer of heat through electromagnetic waves is called ______.
Radiation
What is the difference between temperature and heat?
Temperature is a measure of the average kinetic energy of particles, while heat is the energy transferred due to temperature difference.
True or False: Convection currents can occur in both liquids and gases.
True
What is the role of an insulator in heat transfer?
To reduce the rate of heat transfer.
Multiple Choice: Which law states that energy cannot be created or destroyed, only transformed? A) Newton’s Law B) Law of Conservation of Energy C) First Law of Thermodynamics D) Second Law of Thermodynamics
B) Law of Conservation of Energy
What is a thermodynamic system?
A defined region in which energy transformations take place.
Fill in the blank: The ______ of a substance is the amount of heat needed to convert it from solid to liquid at its melting point.
Heat of fusion
True or False: Heat can be transferred in a vacuum.
True
