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Thermal Energy Exam

Terms in this set (21)

Thermal Energy
Thermal energy is the internal energy of an object due to the kinetic energy of its atoms and/or molecules.
Temperature (L2)
A measure of the warmth or coldness of an object or substance with reference to some standard value.
Heat (L3,6)
Heat is a form of energy that can be transferred from one object to another or even created at the expense of the loss of other forms of energy.
Conduction (L6)
the transfer of heat between two parts of a stationary system
Insulating
material that is used to stop the passage of electricity, heat, or sound from one conductor to another.
Thermal energy transfer
The hotter an object is, the more infrared radiation it gives off.
Conducting
"safe passage or guidance from one place to another."
Thermal equilibrium (L8)
Two physical systems are in thermal equilibrium if no heat flows between them when they are connected by a path permeable to heat. Thermal equilibrium obeys the zeroth law of thermodynamics.
Calorie (L10)
Food
As particles move faster and faster, the amount of kinetic energy increases, and therefore the amount of thermal energy decreases.
False
Thermal energy can best be described as
a. the total amount of kinetic energy within he particles that make up an object.
b. the amount of energy associated with gravitational pull.
c. the energy that holds the nuclei of an atom together.
d. the transfer of heat energy to kinetic energy.
a. the total amount of kinetic energy within he particles that make up an object.
Is thermal energy dependent on the mass of the substance, the temperature of the substance, both, or neither?
a. Mass and temperature
b. Mass only
c. Temperature only
d. Neither mass or temperature
a. Mass and temperature
As particles gain more thermal energy, the speed at which those particles move _______. The particles of a _______ have the fastest moving particles and thus the most amount of thermal energy.
a. increases; solid
b. decreases; liquid
c. remains the same; gas
d. increases; gas
e. degreases; solid
d. increases; gas
When you feel something "cold" you are actually sensing that your body is _ (gaining or losing) thermal energy.
When you feel something "cold" you are actually sensing that your body is ___ (gaining or losing) thermal energy.
Losing
When an ice cube melts, the ice cube is losing thermal energy.
False
Situation 1: A cold spoon is placed in a cup of hot tea.
Situation 2: An ice cube is placed in a cup of hot tea.
Is energy being transferred in either of these situations?
a. Energy is transferred in both situations.
b. Energy is NOT transferred in either situation.
c. Energy is transferred in Situation 1 only.
d. Energy is transferred in Situation 2 only.
a. Energy is transferred in both situations.
A cold object is in contact with a warm object. Which of the following describes the transfer of energy between the two objects?
a. Thermal energy is transferred from the warm object to the cold object.
b. Cold energy is transferred from the cold object to the warm object.
c. Thermal energy is transferred from the warm object to the cold object, and cold energy is transferred from the cold object to the warm object.
d. No energy is transferred between the warm and cold object.
a. Thermal energy is transferred from the warm object to the cold object.
Heat is a type of energy.
False
Insulating materials transfer less thermal energy than conductors.
True
Thermal equilibrium is the point where
a. hotter molecules move faster than colder molecules.
b. all of the molecules are traveling at different speeds.
c. some particles have more thermal energy than others.
d. all particles are traveling at the same speed.
d. all particles are traveling at the same speed.
Thermal energy transfer until the point where half the molecules have all the energy and the other molecules have none of the energy.
False
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