Theoretical Mechanics Chapter 2: Special cases of force systems in a plane
1 Theoretical Mechanics
理论力学 AL 2
2
Statics Introduction Force system: coplanar force system or three-dimensional x无法显 force system C planar (coplanar system of concurrent forces force 2coplanar system of parallel forces(coplanar system: system of force couples is a special cast general case of a force system in a plane Special kast of force system in a plane: coplanar system bf concurrent forces, coplanar system of force couples and coplanar system df parallel forces Coplanar system of concurrent forces: Example: the Forces whose lines of action intersect at one hook ofla crane point are called concurrent, if all the concurrent forces acting on a body lie in one plane - the form a coplanar system of concurrent forces The methods of study: the graphical method 72 and the analytical method 3
3 Coplanar system of concurrent forces: Forces whose lines of action intersect at one point are called concurrent, if all the concurrent forces acting on a body lie in one plane, they form a coplanar system of concurrent forces. Introduction ①coplanar system of concurrent forces ②coplanar system of parallel forces (coplanar system of force couples is a special cast) ③general case of a force system in a plane The methods of study: the graphical method and the analytical method. Example: the hook of a crane Force system: coplanar force system or three-dimensional force system Coplanar force system: Special cast of force system in a plane: coplanar system of concurrent forces, coplanar system of force couples and coplanar system of parallel forces
学 引言 力系为面力系、空间力系 ①平面汇交力系 平面力系②平面平行力系(平面力偶系是其中的特殊情况) (③平面一般力系平面任意力系) 平面特殊力系:指的是平面汇交力系、平面力偶系和平面平 行力系 平面汁交力系: 各力的作用线都在同一平面内且例:起重机的挂钩 汇交升一点的力系。 T 研究方法:几何法,解析法。 12
4 平面汇交力系： 各力的作用线都在同一平面内且 汇交于一点的力系。 引 言 ①平面汇交力系 平面力系 ②平面平行力系(平面力偶系是其中的特殊情况 ) ③平面一般力系(平面任意力系) 研究方法：几何法，解析法。 例：起重机的挂钩。 力系分为：平面力系、空间力系 平面特殊力系：指的是平面汇交力系、平面力偶系和平面平 行力系
Chapter 2: Special cases of force systems in a plane 82-1 The graphical method of composition and the equilibrium of a coplanar system of concurrent forces 82-2 The analytical method of composition and the equilibrium of a coplanar system of concurrent forces 82-3 The concepts and the character of a moment and a force couple 82-4 The composition and the equilibrium of a coplanar system of force couples 82-5 The composition and the equilibrium of a coplanar system of parallel forces
5 §2–1 The graphical method of composition and the equilibrium of a coplanar system of concurrent forces §2–2 The analytical method of composition and the equilibrium of a coplanar system of concurrent forces §2–3 The concepts and the character of a moment and a force couple §2–4 The composition and the equilibrium of a coplanar system of force couples §2–5 The composition and the equilibrium of a coplanar system of parallel forces Chapter 2: Special cases of force systems in a plane