1. (a) Define what a Joule is.
2. (b) State the principle of conservation of energy.
3. (c) A pupil picks up a book from the floor and places the book on a table.
(i) Has the book gained energy? Explain your answer.
(ii) Has the pupil lost energy? Explain your answer.
(iii) Why is it likely that the energy lost by the pupil is not the same magnitude as the energy gained by the book?