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Planar Kinematics of a Rigid Body

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					Planar Kinematics of a Rigid Body: Review I


  1. Particle vs. Rigid body
  2. Planar motion vs. Spatial motion
  3. Type of planar motion




                     ME 316 Handout 1         1
Review: Planar Kinematics of a Rigid Body

1. Particle Versus Rigid Body
       A
                   Particle: A & B have the same motion

           B

        A
                    Rigid body: A and B may have different
                    motions
               B

                       ME 316 Handout 1                   2
2. Planar motion vs. Spatial motion

Example 1




                  ME 316 Handout 1    3
Example 2




            ME 316 Handout 1   4
Spatial motion - Example




  ME 316 Handout 1         5
    Planar motion – Scientific Definition

  All particles of a rigid body move along paths
  which are equidistant from a fixed plane, the body
  is said to undergo planar motion


A body system consists of several rigid bodies. When
all rigid bodies undergo planar motion, the system is
said to undergo planar motion


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3. Types of planar motion

Translation




                 ME 316 Handout 1   7
 3. Types of planar motion

Rotation at a fixed axis

                                  Planar general motion




                           ME 316 Handout 1               8
Types of planar motion – Scientific definition

Translation: every line segment on the body remains
  parallel to its original direction during the motion

Rotation about a fixed axis: all the particles move
  along circular paths

General plane motion: a combination of translation
  and rotation.



                      ME 316 Handout 1                   9

				
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