[Work and Conservation of Energy]

Question 1

1. Work Done By a Force

Answer 1

W. Force x distance moved in the direction of the force. Equals energy transferred. It is a scalar quantity. Measured in joules, J. W = F x cos θ.

Question 2

2. Energy

Answer 2

E. The capacity for doing work. It is a scalar quantity. Measured in joules, J. Forms of energy include: kinetic, gravitational potential, chemical, elastic potential, electrical potential, nuclear, radiant (or EM), sound, internal (or heat or thermal).

Question 3

3. Joule

Answer 3

J. One joule is the energy transferred when a one newton force moves a distance of one metre in the direction of the force.
1 J = 1 Nm.

Question 4

4. Principle of Conservation of Energy

Answer 4

The total energy of a closed system remains constant; energy can never be created or destroyed, but it can be transferred from one form into another. Σ E IN = Σ E OUT.