![]() ![]() A change in the position of a rigid body is more complicated to describe. For our purposes, then, a rigid body is a solid which requires large forces to deform it appreciably.Ī change in the position of a particle in three-dimensional space can be completely specified by three coordinates. No truly rigid body exists external forces can deform any solid. Each part of the worm drive-both the worm and the worm gear-is rotating on its own axis.Ī rigid body is an object of a finite extent in which all the distances between the component particles are constant. See also: Rigid body An example of rotation. For these reasons, rotation around a fixed axis is typically taught in introductory physics courses after students have mastered linear motion the full generality of rotational motion is not usually taught in introductory physics classes. The expressions for the kinetic energy of the object, and for the forces on the parts of the object, are also simpler for rotation around a fixed axis, than for general rotational motion. The kinematics and dynamics of rotation around a fixed axis of a rigid body are mathematically much simpler than those for free rotation of a rigid body they are entirely analogous to those of linear motion along a single fixed direction, which is not true for free rotation of a rigid body. This concept assumes that the rotation is also stable, such that no torque is required to keep it going. ![]() According to Euler's rotation theorem, simultaneous rotation along a number of stationary axes at the same time is impossible if two rotations are forced at the same time, a new axis of rotation will result. This type of motion excludes the possibility of the instantaneous axis of rotation changing its orientation and cannot describe such phenomena as wobbling or precession. Rotation around a fixed axis or axial rotation is a special case of rotational motion around a axis of rotation fixed, stationary, or static in three-dimensional space. ![]()
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