6.8.1 Understanding Precession Flashcards
Understanding Precession
- When an external torque is applied to a spinning object along an axis different from the axis of rotation, precession can result. Precession is the slow rotation of a spinning object’s axis of rotation.
- Remember that . A gyroscope precesses because the torque generated by gravity changes the direction of but not its magnitude.
The equation d theta/dt = mgb/Iw has important implications for the occurrence of precession. As related to the precesison of a gyroscope, which of the following is not correct?
The larger the value of w, the faster the gyroscope will precess
Which of the following statements regarding precession is not correct?
A gyroscope with a value of L initial equal to 0 would not precess; instead its axis would remain in a straight line when placed on a comical stand
Which of the following statements regarding the precession of a gyroscope is not correct?
With Fgravity, thje gyroscope’s axis moves in an elliptical path
The diagrams show the movement of a rapidly spinning gyroscope on a conical stand. The terms Li equals the initial angular momentum, and Lf equals the final angular momentum of the gyroscope’s axis. Which of the following is the equation needed to solve for dL in this system?
dL = (mgb)dtj
The diagram depicts a rapidly spinning gyroscope on a conical stand. The x-, y-, and z-coordinates are also shown. (In this example, the y-coordinate points into the page.) Which of the following vector equations for the net torque on the system is correct?
tnet = bmgj
Precession is ________________.
the motion executed by a gyroscope with a rapidly moving internal flywheel subject to external torque and characterized by the circular motion of its axis
The diagram shows a rapidly spinning gyroscope on a conical stand, viewed from the top and side. The x-, y-, and z-coordinates are also shown. Which of the following equations for the angular momentum of the gyroscope is correct?
L = Iw
