Theoretical Mechanics Chapter 5? Force ytem in Space
1 Theoretical Mechanics
理论力学 第五二力系
2
Statics Practically,there exists many force systems in which the action lines of the forces are not coplanar these are force systems in space They are the most general force systems Diagram(a)is a concurrent forces system in space Diagram(b)is an arbitrary force system in space, if neglecting the forces of the wind from the side it is a parallel force system in space The force of wind fren the front The force of(o P wind from the side (b)
3 Practically, there exists many force systems in which the action lines of the forces are not coplanar, these are force systems in space. They are the most general force systems. Diagram (a) is a concurrent forces system in space. Diagram (b) is an arbitrary force system in space, if neglecting the forces of the wind from the side it is a parallel force system in space. The force of wind from the front The force of wind from the side b
学 工程中常常存在着很多各力的作用线不在同一平面内的力 系,即空间力系,空间力系是最一般的力系 a)图为空间汇交力系;(b)图为空间任意力系 (b)图中去了风力为空间平行力系。 迎面 风力 侧面 P 风力 (b)
4 工程中常常存在着很多各力的作用线不在同一平面内的力 系，即空间力系，空间力系是最一般的力系。 (a)图为空间汇交力系；(b)图为空间任意力系； (b)图中去了风力为空间平行力系。 迎 面 风 力 侧 面 风 力 b
Chapter 5: Force system in space 85-1 Concurrent force system in space 85-2 System of force couples in space D85-3 The moment of a force about a point or an axis $5-4 Reduction of a force system in space to a given point 2$5-5 Discussion of the result of the reduction of a force system in space 85-6 Equilibrium equations of a force system in space and their applications D85-7 The center of a system of parallel forces and the center of gravity of an object Class of exercises
5 Chapter 5: Force system in space §5–1 Concurrent force system in space §5–2 System of force couples in space §5–3 The moment of a force about a point or an axis §5–4 Reduction of a force system in space to a given point §5–5 Discussion of the result of the reduction of a force system in space §5–6 Equilibrium equations of a force system in space and their applications §5–7 The center of a system of parallel forces and the center of gravity of an object Class of exercises