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?