Work and conservation of energy

Question 1

State the principle of conservation of energy.

Answer 1

The total energy of a closed system remains constant- energy can never be created or destroyed, but it can be transferred from one form to another.

Question 2

Define the Joule.

Answer 2

1 Joule is the work done when a force of 1N moves its point of application 1m in the direction of the force.