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King Fahd University of Petroleum

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Chapter 18 Planar Kinetics of Rigid Bodies: ... Example K.E. of the Body of Bike and man ( translational ) K.E of the wheel ( Translational + Rotational ) ... – PowerPoint PPT presentation

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Title: King Fahd University of Petroleum


1
King Fahd University of Petroleum Minerals
  • Mechanical Engineering
  • Dynamics ME 201
  • BY
  • Dr. Meyassar N. Al-Haddad
  • Lecture 34

2
Chapter 18 Planar Kinetics of Rigid Bodies Work
and Energy
3
Kinetic Energy
4
General
Translation
Rotation
5
Rotation
6
General Plane Motion (Translation and Rotation)
7
Example
K.E. of the Body of Bike and man ( translational
)
K.E of the wheel ( Translational Rotational )
Total K.E. 2 Twheel T BMan
8
Example 18-1
mB6 kg mD10 kg mC12 kg No slipping Total K.E
?
Block (Translation)
Disk (Rotation)
Cylinder ( Translation Rotation)
9
Problem 18-3
K.E. system ? WABWCD10 Ib WBC20 Ib
10
The work of a force
11
  • Work of a Spring Force

12
Force That Do No Work
  • Force Perpendicular to the displacement
  • Weight
  • Normal reaction

Rolling resistance force Fr Fr acts at point
which has zero velocity The point is not
displaced
13
Pin Reaction
Pin Reaction Do No work Act on zero velocity and
create no displacement
14
The Work of a couple
-Do work only when the body undergoes a
rotation -Translation positive work cancels
the negative work -Rotation
15
Example 18-2
m 10 kg M 50 Nm P 80N, unstretched 0.5 m
total work ?
16
Thank you
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