ch7+1410+FA11+part+1

# ch7+1410+FA11+part+1 - Chapter 7 Rotational Motion and The...

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Chapter 7 Rotational Motion and The Law of Gravity

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The Radian ! The radian is a unit of angular measure ! The radian can be defined as the arc length s along a circle divided by the radius r !

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Angular Displacement ! Axis of rotation is the center of the disk ! Need a fixed reference line ! During time t, the reference line moves through angle θ
Ex: 7.P.002 A bicycle wheel has a radius of 0.347 m. How far (path length) does a point on the circumference travel if the wheel is rotated through angles of 30°, 30 rad, and 30 rev, respectively? How many revolutions is 30 radians?

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Ex: 7.P.002 Solution Don’t forget to use radian measure with s = r θ 0.182 m 10.4 m 65.4 m
Rigid Body ! Every point on the object undergoes circular motion about the point O ! All parts of the object of the body rotate through the same angle during the same time ! The object is considered to be a rigid body ! This means that each part of the body is fixed in position relative to all other parts of the body

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Angular Displacement, cont.
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