Theoretical Mechanics Chapter 3 General Coplana Force System
1 Theoretical Mechanics
理论力学 三72
2
Statics Chapter 3: General Coplanar Force System General coplanar force system: Several forces act on a body, the lines of action of these forces are in a plane, but they dont intersect at one point and are not parallel. Example B YA P Reduction of a force system to a given point: Reduce an unknown force system(a general coplanar force system) to a known force system(a coplanar system of concurrent forces and a coplanar system of force couples) 3
3 Chapter 3: General Coplanar Force System General coplanar force system: Several forces act on a body, the lines of action of these forces are in a plane, but they don’t intersect at one point and are not parallel. [Example] Reduction of a force system to a given point: Reduce an unknown force system(a general coplanar force system) to a known force system(a coplanar system of concurrent forces and a coplanar system of force couples)
学 第三章平面任意力系 平面任意力系:各力的作用线在同一平面内,既不汇交为一点 又不相互平行的力系叫~ [例 B LA P N 力系向一点简化:把未知力系(平面任意力系)变成已知 力系(平面汇交力系和平面力偶系)
4 第三章 平面任意力系 平面任意力系：各力的作用线在同一平面内，既不汇交为一点 又不相互平行的力系叫∼。 [例] 力系向一点简化：把未知力系（平面任意力系）变成已知 力系（平面汇交力系和平面力偶系）
Chapter 3: General Coplanar force system s3-1 Theorem of translation of a force o83-2 Reduction of a general coplanar force system to a given point 83-3 Result of reduction of a general coplanar force system the law of the resultant moment 83-4 Conditions and equations for the equilibrium of a general coplanar force system b83-5 equilibrium equations of a coplanar system of parallel forces 83-6 The concepts of statically determinate and statically indeterminate problems the equilibrium of a body system 83-7 Analysis of internal force of simple plane truss Exercises
5 Chapter 3: General Coplanar Force System §3–1 Theorem of translation of a force §3–2 Reduction of a general coplanar force system to a given point §3–3 Result of reduction of a general coplanar force system • the law of the resultant moment §3–4 Conditions and equations for the equilibrium of a general coplanar force system §3–5 equilibrium equations of a coplanar system of parallel forces §3–6 The concepts of statically determinate and statically indeterminate problems • the equilibrium of a body system §3–7 Analysis of internal force of simple plane truss Exercises