Part 18

Caroline. This then is the reason why, when I throw a ball obliquely against the wall, it rebounds in an opposite oblique direction, forming equal angles of incidence and of reflection.

Mrs. B. Certainly; and you will find that the more obliquely you throw the ball, the more obliquely it will rebound.

We must now conclude; but I shall have some further observations to make upon the laws of motion, at our next meeting.

Questions

1. (Pg. 32) On what is the science of mechanics founded?

2. (Pg. 32) In what does motion consist?

3. (Pg. 33) What is the consequence of inertia, on a body at rest?

4. (Pg. 33) What do we call that which produces motion?

5. (Pg. 33) Give some examples.

6. (Pg. 33) What may we say of gravity, of cohesion, and of heat, as forces?

7. (Pg. 33) How will a body move, if acted on by a single force?

8. (Pg. 33) What is the reason of this?

9. (Pg. 33) What do we intend by the term velocity, and to what is it proportional?

10. (Pg. 33) Velocity is divided into absolute and relative; what is meant by absolute velocity?

11. (Pg. 33) How is relative velocity distinguished?

12. (Pg. 34) How do we measure the velocity of a body?

13. (Pg. 34) The time?

14. (Pg. 34) The space?

15. (Pg. 34) What is uniform motion? and give an example.

16. (Pg. 34) How is uniform motion produced?

17. (Pg. 34) A ball struck by a bat gradually loses its motion; what causes produce this effect?

18. (Pg. 35) If gravity did not draw a projected body towards the earth, and the resistance of the air were removed, what would be the consequence?

19. (Pg. 35) In this case would not a great degree of force be required to produce a continued motion?

20. (Pg. 35) What is retarded motion?

21. (Pg. 35) Give some examples.

22. (Pg. 36) What is accelerated motion?

23. (Pg. 36) Give an example.

24. (Pg. 36) Explain the mode in which gravity operates in producing this effect.