Part 23

5. (Pg. 47) How would the body move if so impelled?

6. (Pg. 47) If the forces are unequal and not at right angles, how would the body move, as illustrated by fig. 7?

7. (Pg. 47) How must a body be acted on, to produce motion in a curve, and what example is given?

8. (Pg. 48) When is a body said to revolve in a plane, and what is meant by the centre of motion?

9. (Pg. 48) What is intended by the axis of motion, and what are examples?

10. (Pg. 48) What is the middle point of a body called?

11. (Pg. 48) What is said of the axis of motion, whilst the body is revolving?

12. (Pg. 48) When a body revolves on an axis, do all its parts move with equal velocity?

13. (Pg. 49) How is this explained by fig. 1. plate 3?

14. (Pg. 49) What are the two forces called which cause a body to move in a curve; and what proportion do these two forces bear to each other when a body revolves round a centre?

15. (Pg. 49) If the centripetal force were destroyed, how would a body be carried by the centrifugal?

16. (Pg. 50) Explain what is meant by a tangent, as shown in fig. 2. plate 3.

17. (Pg. 50) What forces impede a body thrown horizontally?

18. (Pg. 50) Give the reason why a body so projected, falls in a curve. (fig. 3. plate 3.)

19. (Pg. 51) The curve in which it falls, is not a part of a true circle: what is it denominated?

20. (Pg. 51) What is the centre of gravity defined to be?

21. (Pg. 51) What results from supporting, or not supporting the centre of gravity?

22. (Pg. 51) What is intended to be explained by fig. 4. plate 3?

23. (Pg. 51) What would be the effect of taking off the upper portion of the load?

24. (Pg. 52) When will a carriage stand most firmly?

25. (Pg. 52) What is said of the centre of gravity of the human body, and how does a rope dancer preserve his equilibrium?

26. (Pg. 52) Why cannot a sphere remain at rest on an inclined plane? (fig. 5. plate 3.)

27. (Pg. 52) A cylinder of wood, may be made to rise to a small distance up an inclined plane. How may this be effected? (fig. 5. plate 3.)

28. (Pg. 53) When do we find the centres of gravity, and of magnitude in different points?

29. (Pg. 53) What influence will the density of the parts of a body exert upon its stability?

30. (Pg. 53) What other circumstance materially affects the firmness of position? (fig. 6. plate 3.)

31. (Pg. 53) Why is it more easy to carry a weight in each hand, than in one only?

32. (Pg. 53) What is said respecting two bodies united by an inflexible rod?