motion according to trajectory
DESCRIPTION
This power point is for basics and in particular for 4CPPTRANSCRIPT
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Rectilinear Translation motionAll parts of the object have the same speed.
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Rectilinear Translation motionAll parts of the object have the same speed.
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Rectilinear Centre of mass used to quantify amount of
movement
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Curvilinear motion is a type of translationAll parts of the object have the same speed.
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Curvilinear motion is a type of translationAll parts of the object have the same speed.
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Rotation (or angular motion)Different parts of the body have different
speeds
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Rotation (or angular motion)Different parts of the body have different
speeds
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General Motion Consists of both translation and rotation
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General Motion Use centre of mass for translation
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General Motion Use angles for rotation
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Angular Displacement
Angles are measured in an anticlockwise direction from the right hand horizontal (usually the positive
x axis)
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Angular Displacement
Angles are measured in an anticlockwise direction from the right hand horizontal (usually the positive
x axis)
70 deg
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Only absolute angles of segments measured from right hand horizontal.
These give the angle of a segment
110 deg
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Relative angles are measured between segments. (ie the angle of a joint).
70 deg
60 deg
thigh = 60 degshank = 70 deg
knee = shank - thigh = 10 deg
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Angles often measured as angles of flexion from the anatomical position
(ie anatomical position is assigned the value of zero).
10 deg
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Note: direction of positive and negative is entirely arbitrary for relative angles.
There is no accepted convention
0 deg
-20 deg
+20 deg