motion of rigid body
motion of rigid body
Agenda today 1 rigid body,its kinetic energy 2 the moment of inertia 3 Newton's law of rotation
Agenda today 1 rigid body, its kinetic energy 2 the moment of inertia 3 Newton’s law of rotation
Rigid body(刚体)： The object has a shape unchangeable A rigid body can be treated as a group of particles with their distance unchangeable
Rigid body(刚体）： The object has a shape unchangeable A rigid body can be treated as a group of particles with their distance unchangeable
The kinetic energy of a rigid body rotating with a fixed axis 2n旷-nrio 2 Rotational kinetic energy: E-∑mo2=wy Ek
The kinetic energy of a rigid body rotating with a fixed axis 2 2 2 2 1 2 1 mi vi mi ri Rotational kinetic energy: 2 2 2 2 2 1 2 1 Ek mi ri mi ri 2 2 1 Ek J mi z i r i v
Moment of inertia(惯量) The inertia of the rigid body that is rotating definition J=∑△m,r2 A continuous body: J=Sr2dm the moment of inertia of one rigid body is determined by its shape the position of the axis and the density distribution
Moment of inertia（惯量） The inertia of the rigid body that is rotating definition 2 i i J m r A continuous body: J r dm2 the moment of inertia of one rigid body is determined by its shape , the position of the axis and the density distribution