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Chapter 2 Kinematics

Chapter 2 KinematicsQuestion 2 1A bugBcrawls radially outward at constant speedv0from the center of a ro-tating disk as shown in Fig. P2-1. Knowing that the disk rotates about its cen-terOwith constant absolute angular velocity relative to the ground (wherek k = ), determine the velocity and acceleration of the bug as viewed by anobserver fixed to the Figure P2-1 Solution to Question 2 1 For this problem it is convenient to choose a fixed reference frameFand a non-inertial reference frameAthat is fixed in the disk. Corresponding to referenceframeFwe choose the following coordinate system:Origin at PointOEx=AlongOBat Timet=0Ez=Out of PageEy=Ez Ex2 Chapter 2. KinematicsCorresponding to the reference frameAthat is fixed in the disk, we choose thefollowing coordinate systemOrigin at PointOex=AlongOBez=Out of Page(=Ez)ey=ez exThe position of the bug is then resolved in the basis{ex,ey,ez}asr=rex( )Now, since the platform rotates about theez-direction relative to the ground,the angular velocity of reference frameAin reference frameFis given asF A= ez( )The velocity is found by applying the basic kinematic givesFv=Fdrdt=Adrdt+F A r( )Now we haveAdrdt= rex=v0ex( )F A r= ez rex= rey( )Adding Eqs.

4 Chapter 2. Kinematics Finally, corresponding to reference frame B, we choose the following coordinate system: Origin at point O er = Along OP ez = Out of Page eθ = ez ×er Then, the position of the particle can be desribed in terms of the basis {er,eθ,ez} as r = rer. (2.10) Now, in order to compute the velocity of the particle, it is ...

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