Chapter 3 - 3.1

Question 1

All forms of energy are either …

Answer 1

Kinetic or potential

Question 2

Equation for Kinetic Energy

Answer 2

E(subscript k) = (1/2)mu^2

Question 3

Thermal energy is associated with…

Answer 3

Random motion of atoms and molecules

Question 4

How is thermal energy measured?

Answer 4

Changes in temperature

Question 5

What is potential energy?

Answer 5

Energy from position

Question 6

What are the two kinds of potential energy?

Describe them

Answer 6

Chemical and Electrostatic energy
Chemical : energy from atom and molecular structure units

Electrostatic energy:
Energy from interaction of charged particles

Question 7

Equation for electrostatic charge:

Answer 7

E(el) = (Q1)(Q2)/d

Q1 and Q2 = the charged particles
d = distance

Like charges = repulsion (positive E(el)
Opposite charges = attraction (negative E(el))

Question 8

Law of Conservation of Energy

Answer 8

Energy cannot be made or destroyed only transformed.

Question 9

SI unit of Energy

Answer 9

Joule

Question 10

Joule in terms of kinetic energy

Answer 10

E(k) = 1/2 (2 kg) * (m^2/s^2) = 1 J

1 N = 1 kg*m/s
1 kJ = 1000 J