4. The purpose of learning theoretical mechanics1. To lay a foundation for solving engineeringproblems;2. The basis for a series of subseguent courses:3. Develop the ability to analyze and solveproblems correctly
4. The purpose of learning theoretical mechanics ———————————————————————— 1. To lay a foundation for solving engineering problems; 2. The basis for a series of subsequent courses; 3. Develop the ability to analyze and solve problems correctly
Mechanical ModelMechanical ModelParticle & Particles' systemWhen the motion range of the object we studied is farbeyond its own geometric size, the shape and size of theobject have little influence on its motion, and its geometricshape and size can be ignored. At this time, it can beabstracted as a particle with only mass but no volume.System of particles -A system consisting of a finiteor infinite number of particles, includes particle, rigidbody, deformed body and fluid, etc
Mechanical Model —— Particle & Particles’ system When the motion range of the object we studied is far beyond its own geometric size, the shape and size of the object have little influence on its motion, and its geometric shape and size can be ignored. At this time, it can be abstracted as a particle with only mass but no volume. System of particles ——A system consisting of a finite or infinite number of particles, includes particle, rigid body, deformed body and fluid, etc. Mechanical Model
Mechanical ModelAn aircraft can beregarded as a particlewhen studying itstrajectory
Mechanical Model —————————————————————— An aircraft can be regarded as a particle when studying its trajectory
MechanicalModelA satellite can be regarded as a particlewhen studying its motion trajectory. Butwhen studying satellite attitude control, itshould be regarded as rigid body
Mechanical Model —————————————————————— A satellite can be regarded as a particle when studying its motion trajectory. But when studying satellite attitude control, it should be regarded as rigid body
Mechanics courseDiscipline classification :General Mechanics: The emphasis is on generalparticle systems and rigid systemsSolid Mechanics: Focus on solid (elastoplastic body)Fluid Mechanics: Focus on fluids (liquids and gases)Character of the subject :Mechanics is a basic subjectMechanics is a technical subjectMechanics is a bridge across science and engineering
Mechanics course ——————————————————————— Discipline classification： General Mechanics：The emphasis is on general particle systems and rigid systems. Solid Mechanics：Focus on solid (elastoplastic body) Fluid Mechanics：Focus on fluids (liquids and gases) Character of the subject ： Mechanics is a basic subject. Mechanics is a technical subject. Mechanics is a bridge across science and engineering