Concept of Energy: Heat and Work

Question 1

Heat (Q)

Answer 1

form of energy transferred from one body to another by virtue of a temperature difference

Question 2

Work (W)

Answer 2

form of energy that results in the motion of a body by virtue of an opposing force

Question 3

Molecular Mechanism of Heat and Work Transfer

Answer 3

a. Transfer of energy as heat- uses random motion or thermal motion of molecules
b. Transfer of energy as work- uses orderly molecular motion, when work is done by the system to its surroundings, atoms or molecules in the surroundings move in an organized way.

Question 4

External Energy

Answer 4

refers to the energy of the system as a bulk which can be associated with the velocity and location of its center of mass.

Question 5

Kinetic Energy

Answer 5

energy due to the translational motion of the system relative to some point of reference.

Question 6

Potential Energy

Answer 6

Energy due to the position of the system in a potential field such as electromagnetic or gravitational field.

Question 7

Mechanical forms of work

Answer 7

A. Shaft work
B. Spring work
C. Surface tension work