This is why helicopters have a tail rotor, so that they can use the tail rotor to oppose the torque on the body of the helicopter caused by torque on the main overhead rotor, and stabilize the orientation of the helicopter body.
i got the first bit with the right hand rule but got lost on the using the right hand rule the second time when the force was applied on the arm of the axle. The first bit is simple, turn the wheel and use rt hand rule for angular momentum, thats fine. Then apply force, ok, but how is right hand rule applied now? How does the force applied with finger relate to right hand rule?
Given any cross product, you assign the first vector to your pointer finger, and the second vector to your middle finger. The thumb points in the direction of the resultant of this calculation. So for torque = r cross F, the pointer finger is assigned to the radius from the reference point to the point of force application. The middle finger is assigned to the force, and the thumb produces the direction of the torque. Another way to think about it, is suppose we replace the axis of rotation with a fixed rod that has screw threads, and built female threads on the rotating body. Standard right-hand threads, that follow the motto of "righty tighty / lefty loosie". Which way will the rotating body translate in addition to its rotation, if you do this?
with the gyro experiment i got every answer exactly opposite... instead of up i answered down and instead of twards us i got away ... i need to practice
so both axis of rotation of gyroscope and gyroscope have angular momentum ? because force exerting in the axis of rotation of gyroscope has torque 0. but is the angular momentum of system that makes this weird movement?
Think of gyroscopic motion as the rotational equivalent of uniform circular motion, when the force can't directly act on the magnitude of momentum. Rather than the force being aligned or opposite to the momentum to cause a change in speed, it acts perpedicular to momentum to cause a change in direction. The same thing is happening with gyroscopes. The torque is acting perpendicular to the angular momentum, and can't speed it up or slow it down. But instead, it pulls the axis of rotation toward it, and causes precession.
At 0:56 if I look from above, that top would appear to be precessing counter-clockwise, correct? What change would I need to make in order to get the top to precess in a clockwise direction when I look from above?
@@aswankorula8472 It's the combined effects of torque caused by gravity, and the angular momentum of the top, that determines the direction of precession. As Sirius said, just spin the top clockwise.
@@aswankorula8472 So it would! I was trying to imagine a way to reverse the direction of torque caused by gravity. But spinning the top the other way is easier.
@@glasgowbrian1469 Another way you can reverse the direction of gyroscopic precession, is if you can add counterweights to the system. Consider a wheel that can freely spin, independently of a 50 cm long horizontal rod, initially stationary, that passes through the bearings that mount the wheel. Suppose we mark every 5 cm along this rod, as a reference. Place the wheel's center of mass at the 10 cm mark, and place the pivot at the 25 cm mark. The weight of the wheel will cause the torque, that normally causes precession, but I've set this example up so that there is 25 cm of vacant rod on the other side of the pivot, that we can use for our advantage. If you add a counterweight equal to the weight of the wheel at the 40 cm mark, you will stop the precession all together. Now add a counterweight greater than the weight of the wheel at the 40 cm mark. It will precess in the other direction.
Spin velocity is a perpendicular vector to the tilting seesaw end velocities of the plane, and this tilting end velocity switches ends twice per rotation, instantaneously resolved to acceleration at the tilt axis. Perpendicular vectors DO NOT affect each other, so tangential spin velocity is NOT affected by tangential tilt velocity. Math has people thinking that rules and laws are causal. Contemporary math is analogous and wrong. If you want the truth, go to Elsevier science's SSRN site. It is somewhat hidden. Search SSRN on Elsevier site, at the bottom, a link says "Visit SSRN." Ends up www.ssrn.com. Search abstract ID: 3587972 Or, if you aren't afraid of links: ssrn.com/author=4143288 Please read this paper and support it or refute it if you can. It needs political backing or it will not get published.
The Earth is not a ball and it is not floating in space. If an air plane was flying in any direction at 500 miles per hour the gyroscope would NEVER show level and the pilot would ALWAYS have to push down on the controls to compensate for the curvature of the Earth. But they don't do that because the Earth is FLAT!
A gyroscope would maintain the same orientation as you said. However, airplanes have an erecting mechanism to keep the gyroscope level in respect to gravity. In response to your second point, pilots would have to make adjustments in pitch if they were in a vacuum, but because of the earth's atmosphere they don't. Our atmosphere is curved following the earth's surface, so the forces of lift acting on a plane would naturally cause it to follow the earth's curvature. If an astronaut is orbiting the earth in a space shuttle they would rotate independently of the earth as there would be no atmosphere to create friction as there is at an airplane's cruising altitude.
zlitherer a did you just write something about air curvature.... omg.... And I wonder why there's more and more people believing that the Earth is flat... No, it is not due to atmospheric curvature that a plane is not escaping the Earth's gravity.
@@zlitherera1355 Shhh, don't confuse him with the facts, his mind is already made up. Excellent explanation, by the way. Indeed the gyroscopes on a plane do have to adjust for Earth's curvature, and Earth's rotation, which is a known issue with inertial guidance systems. I've wondered this myself. They use the pendulous vanes that you've called an erecting mechanism, to slowly adjust the gyroscope to level, during periods when the plane is in steady cruising flight. The gyroscope uses conservation of angular momentum to "remember" which direction used to be down, during maneuvers that require pitching and rolling of the plane. It is only when the plane cruises within close margins of a 1-g environment as a sign that it is in a steady/level flight, that it enables the erecting mechanism to correct the gyroscope. At other times, it lets the gyroscope rotate as it naturally would do.
