9. Why can we raise a heavier weight with our hand when lifting from the elbow than from the shoulder?
10. What class of lever do we employ when we are hopping, the thigh bone being bent up toward the body and not used?
11. Describe the motions of the bones when we are using a gimlet.
12. Why do we tire when we stand erect?
13. Why does it rest us to change our work?
14. Why and when is dancing a beneficial exercise?
15. Why can we exert greater force with the back teeth than with the front ones?
16. Why do we lean forward when we wish to rise from a chair?
17. Why does the projection of the heel bone make walking easier?
18. Does a horse travel with less fatigue over a flat than a hilly country?