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ME 316 Handout 1 1
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 2
Review: Planar Kinematics of a Rigid Body
1. Particle Versus Rigid Body
A
B
Particle: A & B have the same motion
A
B
Rigid body: A and B may have different motions
ME 316 Handout 1 3
2. Planar motion vs. Spatial motion
Example 1
ME 316 Handout 1 4
Example 2
ME 316 Handout 1 5
Spatial motion - Example
ME 316 Handout 1 6
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
ME 316 Handout 1 7
3. Types of planar motion
Translation
ME 316 Handout 1 8
3. Types of planar motion
Rotation at a fixed axis
Planar general motion
ME 316 Handout 1 9
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.