Examples of rigid body in the following topics:

 In a motion of a rigid body, different parts of the body have different motions.This means that these bodies may not behave like a point particle.
 To describe the motion of a rigid body (with possibly a complicated geometry), we separate the translational part of the motion from the rotational part.
 We considered that actual three dimensional rigid bodies move such that all constituent particles had the same motion (i.e., same trajectory, velocity and acceleration).
 By doing this, we have essentially considered a rigid body as a point particle.
 This concept of COM, therefore, eliminate the complexities otherwise present in attempting to describe motions of rigid bodies.
 rigid body (noun) An idealized solid whose size and shape are fixed and remain unaltered when forces are applied; used in Newtonian mechanics to model real objects.

 It consists of any rigid body that oscillates about a pivot point.
 The period is still independent of the total mass of the rigid body.
 However, it is not independent of the mass distribution of the rigid body.
 Gravity acts through the center of mass of the rigid body.
 However, it is not independent of the mass distribution of the rigid body.
 physical pendulum (noun) A pendulum where the rod or string is not massless, and may have extended size; that is, an arbitrarilyshaped, rigid body swinging by a pivot.
In this case, the pendulum's period depends on its moment of inertia around the pivot point.

 Derive the center of mass for the translational motion of a rigid body
We can describe the translational motion of a rigid body as if it is a point particle with the total mass located at the COMcenter of mass.
 For the translational motion of a rigid body with mass M, Newton's 2nd law applies as if we are describing the motion of a point particle (with mass M) under the influence of the external force.
 We can describe the translational motion of a rigid body as if it is a point particle with the total mass located at the center of mass (COM).
 The red cross represents the COM of the twobody system.
 rigid body (noun) An idealized solid whose size and shape are fixed and remain unaltered when forces are applied; used in Newtonian mechanics to model real objects.

 rigid extended.
 A force on an extended rigid body is asliding vector.
 nonrigid extended.
 A force on a nonrigid body is a bound vector.
 So you will want to include the following things in the diagram:
The body: This is usually sketched in a schematic way depending on the body  particle/extended, rigid/nonrigid  and on what questions are to be answered.

 This definition can be extended to rigid bodies by defining the work of the torque and rotational kinetic energy.

 The experimental determination of the center of mass of a body uses gravity forces on the body and relies on the fact that in the parallel gravity field near the surface of the earth the center of mass is the same as the center of gravity.
 In the previous atom on "Center of Mass and Translational Motion," we learned why the concept of center of mass (COM) helps solving mechanics problems involving a rigid body.
 The experimental determination of the center of mass of a body uses gravity forces on the body and relies on the fact that in the parallel gravity field near the surface of Earth the center of mass is the same as the center of gravity.
 The center of mass of a body with an axis of symmetry and constant density must lie on this axis.
 In general, for any symmetry of a body, its center of mass will be a fixed point of that symmetry.

 In physics, a force is said to do work when it acts on a body so that there is a displacement of the point of application, however small, in the direction of the force.
 $\delta E=\delta Q\delta W$
Also, from Newton's second law for rigid bodies, it can be shown that work on an object is equal to the change in kinetic energy of that object:
$W=\Delta KE$
The work of forces generated by a potential function is known as potential energy and the forces are said to be conservative.

 To quantify equilibrium for a single object, there are two conditions:
The net external force on the object is zero: $\sum_i \mathbf{F}_i = \mathbf{F}_{net} = 0$
The net external torque, regardless of choice of origin, is also zero : $\sum_i \mathbf{r}_i \times \mathbf{F}_i = \sum_i \mathbf{\tau}_i = \mathbf{\tau}_{net} = 0$
Those two conditions hold regardless of whether the object we are talking about is a single point particle, a rigid body, or a collection of discrete particles.

 Connections can often be approximated as completely rigid.
 The simplest form of connection is a perfectly rigid connection.
 Thus it can be said that a perfectly rigid connection makes two objects into one large object.
 Of course, perfectly rigid connections do not exist in nature.
 However, many materials are sufficiently rigid, so that using the perfectly rigid approximation is useful for simplicity's sake.
 rigid (adjective) Stiff, rather than flexible.

 There is no rigid procedure that will work every time.