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?