rigid

(adjective)

Stiff, rather than flexible.

Examples of rigid in the following topics:

  • Connected Objects

    • 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.
    • Analyze the affect a rigid connection has on the movement of objects
  • The Physical Pendulum

    • Gravity acts through the center of mass of the rigid body.
    • For illustration, let us consider a uniform rigid rod, pivoted from a frame as shown (see ).
    • The moment of inertia of the rigid rod about its center is:
    • However, it is not independent of the mass distribution of the rigid body.
    • A rigid rod with uniform mass distribution hangs from a pivot point.
  • Hypotonia and Hypertonia

    • Effects of hypertonia include spasticity dystonia (a state of prolonged muscle contractions) and rigidity (a state of muscle stiffness and decreased flexibility).
    • Rigidity has two main forms—"leadpipe" rigidity is stiffness of the muscle, maintained throughout the entire range of movement; "cogwheel" rigidity, typical of Parkinson's disease, is the combination of rigidity with tremors, producing spastic movements.
  • The Cell Wall of Bacteria

    • Bacteria are protected by a rigid cell wall composed of peptidoglycans.
    • This rigid structure of peptidoglycan, specific only to prokaryotes, gives the cell shape and surrounds the cytoplasmic membrane.
  • Center of Mass and Translational Motion

    • 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.
    • We describe the translational motion of a rigid body as if it is a point particle with mass m located at COM.
  • General Problem-Solving Tricks

    • rigid extended.
    • A force on an extended rigid body is asliding vector.
    • non-rigid extended.
    • A force on a non-rigid body is a bound vector.
    • The body: This is usually sketched in a schematic way depending on the body - particle/extended, rigid/non-rigid - and on what questions are to be answered.
  • Center of Mass and Inertia

    • The center of mass for a rigid body can be expressed as a triple integral.
    • In the case of a single rigid body, the center of mass is fixed in relation to the body, and if the body has uniform density, it will be located at the centroid.
  • Motion of the Center of Mass

    • We can describe the translational motion of a rigid body as if it is a point particle with the total mass located at the COM—center of mass.
    • 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).
    • Derive the center of mass for the translational motion of a rigid body
  • Properties of Macromolecules

    • HDPE is a rigid translucent solid which softens on heating above 100º C, and can be fashioned into various forms including films.
    • Increased crystallinity is associated with an increase in rigidity, tensile strength and opacity (due to light scattering).
    • Amorphous polymers are usually less rigid, weaker and more easily deformed.
    • At 25% to 35% crosslinking a rigid hard rubber product is formed.
    • At temperatures below Tg, elastomers become rigid glassy solids and lose all elasticity.
  • Cystoscopy

    • There are two main types of cystoscopy (flexible and rigid), and they differ in the flexibility of the cystoscope.
    • Rigid cystoscopy can be performed under the same conditions, but is generally carried out under general anaesthesia, particularly in male subjects, due to the pain caused by the probe.
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