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# Lect16 - Physics 101 Lecture 16 Rotational Kinematics q...

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Physics 101: Lecture 16, Pg 1 Physics 101: Physics 101: Lecture 16 Lecture 16 Rotational Kinematics Rotational Kinematics Today’s lecturewill cover Textbook Chapter 8

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Physics 101: Lecture 16, Pg 2 Rotational Kinematics Rotational Kinematics The motion of a rigid body about a fixed axis is described by using the same concepts as for linear motion (see C&J Chapter 2): Displacement ( ∆θ ), Velocity ( ϖ ), Acceleration ( α ) Angular Displacement: Identify the axis of rotation and choose a line perpendicular to this axis. Observe the motion of a point on this line. How can one define the change of position of this point during rotation about an axis ? Answer: Change of angle the line makes with a reference line: ∆θ
Physics 101: Lecture 16, Pg 3 Angular Displacement Follow point P on line perpendicular to the rotation axis: t=t 0 : t=t f : θ 0 =0 θ f - θ f Angular displacement: ∆ θ = θ f - θ 0 = θ f ∆ θ = - θ f SI unit: radian (rad) 1 rad = 360 degrees/(2 π ) ∆θ (in rad) = arc length / radius = s/r counter clockwise clockwise reference line P

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Lect16 - Physics 101 Lecture 16 Rotational Kinematics q...

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