11. Count the pulleys used in a hay-fork and determine the use of each.
12. If a ton of hay is unloaded at five equal forkfuls, what weight has the horse to draw at each load?
13. Count the cogs on the wheels of a fanning-mill, washing-machine, apple-parer, or egg-beater, and determine how the direction or rate of the motion is changed thereby.
14. Measure the diameter of the large fly-wheel of a thrashing-machine engine, and of that which turns the cylinder in the separator. Decide how many times the cylinder revolves for one turn of the fly-wheel.
15. Think of all the uses of a wedge. Draw one. Compare the axe, knife, and chisel with the wedge.
16. How are heavy logs loaded on a sleigh or truck? How are barrels of salt and sugar loaded and unloaded?
17. There are two hills of the same height. One has a gradual slope, the other a steep one. Which is easier to climb? In what case is it farthest to the top?
18. Why does a cow or horse take a zigzag path when climbing a steep hill?