Revolve ( page 318 ).
Questions.
1. When is a body said to roll? to rotate? to revolve? 2. In what sense may the earth be said to revolve? and in what sense to rotate? 3. What are some of the extended uses of roll? 4. What kind of a word is turn, and what is its meaning?
Examples.
Any bright star close by the pole is seen to —— in a very small circle whose center is the pole itself.
The sun ——s on an axis in the same direction in which the planets —— in their orbits.
Human nature can never rest; once in motion it ——s like the stone of Sisyphus every instant when the resisting force is suspended.