direction of t. (Hint: To go from L -> L + dL, you add dL to the 'tip' of L.) PHYS 165 TOP VIEW w/ Vectors looking down towards table, from above gyroscope). 4 - Main Vids "TedcoGyro2" video To simplify this drawing, let's assume that the Screenshot @ 0:42 s axis of gyroscope Is 90" from vertical, so P, = F. SIDE VIEW w/ Vectors 17% Explain motion: if L - [ + dL. Vectors shown how does the free and move? " - blue Po - : red (dashed] For " red (solid) purple yellow dE - @green End (a) Holding onto the top of a non-spinning (b) Zooming-in on the top of a non-spinning Description: "Free and moves in counter-clockwise [ocwI Tedco gyroscope, while placing the bottom Tedco, showing the T-handle rip cord feeding direction, when viewed from above" onto the black plastic stand. into the left of the gear. Figure 9. (Left) A SIDE VIEW from video TedcoGyro2 (@0:42 s), with key vec- Figure 8: Two pictures of a non-spinning Tedco gyroscope. We define the "top' to be the metal ball tors shown in color. (Right) A simple bow sketch from a TOP VIEW, that you can closest to the plastic gear wheel. use to describe & explain your gyroscope's motion. Hold the top of the Tedco gyroscope, and make sure the rotor is not spinning. Place it on the stand, at an angle, as shown in Fig. 8a. . . Starting with a non-spinning rotor, carefully feed in the rip cord into the LEFT side of the gear wheel, as shown in Fig. 8b. . Before pulling out the rip cord, use the right hand rule to predict the direction of the L once you pull out the rip cord to get the rotor spinning. . Don't jerk the cord suddenly, which will break teeth (because of the rotor's rotational inertia). Instead, smoothly pull on the rip cord, trying to go faster and faster as the wheel spins faster. Place the bottom of the gyroscope on the stand, as in Fig. 8a. Isn't this interesting? You can do this more than once. Fig. 9 (Left) shows the key vectors which explain this behavior. . Fig. 9 (Right) is a sketch you can use to 'describe' and 'explain' the gyroscope's motion. OK to copy this first one, which we give as an example. Starting with a non-spinning rotor, carefully feed in the rip cord into the RIGHT side of the gear wheel. Before pulling out the rip cord, use the right hand rule to predict the direction of the L once you pull out the rip cord to get the rotor spinning. . Pull out the rip cord to start it spinning. Place the bottom of the gyroscope on the stand, as in Fig. 8a.Question 1: Draw Force diagram (like figure 9 (right)) Question 2: Very briefly, describe the gyroscope's motion, using a sketch inspired by Fig. 9 (Right), but updated for this new case. Question 3: Explain why this motion is consistent with the direction of E (Hint: E> 3+ all: you add d; to the 'tip' of I: If the tip of His resting on the stand, then the 'tail' of the Emust do the moving to change the direction.)