This is a chapter of a book that has been published in Persian Language in 2012. Here the physical and static rules of trees are presented and the methods are explained for feeling trees in correct way: balanced trees, low leaning trees, heavy leaning trees, felling of special trees, in steep slopes, releasing hang up trees and using winch.:1. Review of the physical basis of the forces involved in cutting and bucking 1.1. Vector and scalar quantities 1.2. Weight 1.3. Center of gravity 1.4. Fulcrum 1.5. Forces and torque 1.6. Relations between vectors 1.7. Levers 1.7.1. Single and double levers of the first class 1.7.2. Single and double levers of the second class 1.7.3. Single and double levers of the third class 1.8. Efficiency and mechanical advantage 1.9. Work 1.10. Wedge 2. Correct methods in felling trees 2.1. Balanced trees 2.2. Low leaning trees 2.2.1. Felling the low leaning trees in the leaning direction 2.2.2. Felling trees with a low leaning in the side direction of leaning 2.2.3. Felling trees with light leaning in opposite of leaning direction 2.3. Trees with heavy leaning 2.3.1. Felling trees with heavy leaning in leaning direction 2.3.2. Felling trees with heavy leaning in side of leaning direction 2.3.3. Felling trees with heavy leaning in opposite of leaning direction 2.4. Felling of special trees 2.5. Felling of trees in steep slopes 2.6. Release of hang up trees 2.7. Using winch 2.7.1. Felling of trees in leaning direction using winch 2.7.2. Felling of trees in side of leaning direction using winch 2.7.3. Felling of trees in opposite of leaning direction using winch 2.7.4. Safety measures in use of winch / Es handelt sich um ein Kapitel aus einem Buch, das 2012 im persischer Sprache veröffentlicht wurde. Darin werden die physikalischen und statischen Prinzipien von Bäumen dargestellt und die Methoden erklärt, mit denen Bäume korrekt gefällt werden können: aufrechte Bäume, Bäume mit einem leichten und starken Hang, Spezialfällung, Fällung am Steilhang und von Hängern, Einsatz einer Winde.:1. Review of the physical basis of the forces involved in cutting and bucking 1.1. Vector and scalar quantities 1.2. Weight 1.3. Center of gravity 1.4. Fulcrum 1.5. Forces and torque 1.6. Relations between vectors 1.7. Levers 1.7.1. Single and double levers of the first class 1.7.2. Single and double levers of the second class 1.7.3. Single and double levers of the third class 1.8. Efficiency and mechanical advantage 1.9. Work 1.10. Wedge 2. Correct methods in felling trees 2.1. Balanced trees 2.2. Low leaning trees 2.2.1. Felling the low leaning trees in the leaning direction 2.2.2. Felling trees with a low leaning in the side direction of leaning 2.2.3. Felling trees with light leaning in opposite of leaning direction 2.3. Trees with heavy leaning 2.3.1. Felling trees with heavy leaning in leaning direction 2.3.2. Felling trees with heavy leaning in side of leaning direction 2.3.3. Felling trees with heavy leaning in opposite of leaning direction 2.4. Felling of special trees 2.5. Felling of trees in steep slopes 2.6. Release of hang up trees 2.7. Using winch 2.7.1. Felling of trees in leaning direction using winch 2.7.2. Felling of trees in side of leaning direction using winch 2.7.3. Felling of trees in opposite of leaning direction using winch 2.7.4. Safety measures in use of winch