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How the direction of angular momentum is given by right hand rule?
Wiki User
∙ 9y ago
Angular momentum = r x p... That is position vector r, CROSSED (not multiplied) with momentum vector p. So, to find out the direction the angular momentum will act, take ur right hand, point your fingers in the direction of r, and "curl" (close/bend whatever u wanna call it) ur FINGERS (not thumb) towards p. New, whichever way ur thumb points, that is the direction of the angular momentum
Hope that helped
Wiki User
∙ 9y ago
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Why is angular momentum of a body is equal to the product of its moment of inertia and angular velocity?
Angular momentum about the axis of rotation is the moment of linear momentum about the axis. Linear momentum is mv ie product of mass and linear velocity. To get the moment of momentum we multiply mv by r, r the radius vector ie the distance right from the point to the momentum vector. So angular momentum = mv x r But we know v = rw, so angular momentum L = mr2 x w (w-angular velocity) mr2 is nothing but the moment of inertia of the moving body about the axis of rotation. Hence L = I w.
Why is angular displacement a vector quantity?
Angular displacement is a vector quantity because it has both magnitude and direction. The direction of angular displacement is determined by the axis of rotation and follows the right-hand rule, while the magnitude is given by the angle of rotation. As a vector, angular displacement can be added, subtracted, and resolved into components, making it useful in calculations that involve rotational motion.
What is the difference between positive and negative momentum?
The difference between positive and negative momentum is the direction that the object is going. Left and down are negative, right and up are positive. For example: if a ball is rolling to the left, it has a negative momentum.
Newton's third law states?
Newton's third law is..."For every action there is an equal and opposite reaction."This is probably the hardest law to really understand.It really helps to understand this law if you understand that the law has its origin in the conservation of momentum principle.The fact of the matter is, force can be most fundamentally understood to be the rate of change of momentum.Let me explain why.First momentum is..P=mvNow look at the equation for force.F=maIt is very similar except that in place of P we have F and in place of v we have a.Looking at the force equation again..f=mawe note that acceleration is the rate of change of velocity so...F=m dv/dtNow since the mass, m, is constant we can put it directly beside the velocity like so..F=d(mv)/dtThis is looking more like the below momentum equation...P=mvThe only difference is that for the momentum equation, we have, mv, and for the force equation we have the rate of change of, mv, or, d(mv)/dtNow in the force equationF=d(mv)/dtbecause P = mv, we can replace, mv with P...F=dP/dtAs I said, force is the rate of change of momentum.Now since the law of conservation of momentum states that momentum is neither created nor destroyed, if an object picks up momentum, another object to lose momentum. In Newton's third law the "action" force is the second body picking upmomentum and the "reaction" force is the first body losing that momentum.As an example, imagine two people standing on a very slippery skating rink, because they are standing still, together, they have zero momentum. If one person pushes the second person, or "applies a force" on the second person, the second person has momentum delivered to them and that second person picks up speed/momentum in that direction. The first person however picks up speed/momentum in the other direction, which means that he also had momentum delivered to him. That second person picking up momentum was the "action force", and that first person picking up momentum in the other direction was the "reaction force".The second person picked up momentum in one direction, and since there is the conservation of momentum law, the first picked up momentum in the opposite direction. Their momentum was zero before the event and since momentum has direction the sum of both momenta add up to zero after the event.If both people had been moving, for example, to the right and the first person pushed the second person also to the right, the second person would have picked up momentum to the right and the first person would have only lost momentum to the right. There would have still been both an action and a reaction force however because momentum was only exchanged.
What types of simple machine can not change the direction of a force?
Except first order lever, both second and third order levers will not change the direction of force. Hope I have given the right one. I am not sure about the idea behind the question.
Why is angular momentum of a body is equal to the product of its moment of inertia and angular velocity?
Angular momentum about the axis of rotation is the moment of linear momentum about the axis. Linear momentum is mv ie product of mass and linear velocity. To get the moment of momentum we multiply mv by r, r the radius vector ie the distance right from the point to the momentum vector. So angular momentum = mv x r But we know v = rw, so angular momentum L = mr2 x w (w-angular velocity) mr2 is nothing but the moment of inertia of the moving body about the axis of rotation. Hence L = I w.
Why is angular displacement a vector quantity?
Angular displacement is a vector quantity because it has both magnitude and direction. The direction of angular displacement is determined by the axis of rotation and follows the right-hand rule, while the magnitude is given by the angle of rotation. As a vector, angular displacement can be added, subtracted, and resolved into components, making it useful in calculations that involve rotational motion.
Why does your body go left when a bus turns right?
Momentum. Momentum is mass x velocity. Velocity is speed in a direction. Even if the bus changes direction, you still have momentum in the original direction until some force pushes you in another direction. That takes a moment in a car or bus, so until your momentum is that of the bus, you'll still be going in a slightly different direction, which happens to seem 'outwards'.
What is the difference betweentangential velocity or angular velocity?
angular velocity s the rotational analague of linear velocity...direction of linear velocity s along tangent to the circle while that of angulr velocity s along the axis of rotation.the direction of angular v can be find by right hand rule which state that if the axis of rotation s held n right hand with fingers curled round the direction of rotation then the thumb will mark the direction of angular velocity.... the magnitude of angular velocity that s the angular speed is represented by the length of the line along the axis of rotation...its units are rad/sec,degrees/sec or revolution/sec while that of linear velocity s m/sec...
What is the difference between positive and negative momentum?
The difference between positive and negative momentum is the direction that the object is going. Left and down are negative, right and up are positive. For example: if a ball is rolling to the left, it has a negative momentum.
How gyroscopic couple work in a aroplanes and ship?
Effect of the Gyroscopic Couple on an ship and Aeroplane :-Ships and aeroplanes consist of large moment of inertia propeller and fly wheels. When aeroplane or ship takes right or left turn there occurs a rate of change of angular momentum because of change of direction of angular momentum vector. Thus a counter couple is produced when they terns.When the engine or propeller of aeroplane or fly wheel of ship rotate such that the spin angular momentum vector is along the sailing direction and when the aeroplane or ship takes a left turn, then the effect of reactive gyroscopic couple will be to dip the nose (stem: for ship) and raise the tail of the aeroplane or ship.When the aeroplane or ship takes a right turn under similar conditions above, the effect of reactive gyroscopic couple will be to raise the nose and dip the tail of the aeroplane or ship.In the case of ships the fly wheel must be mounded such that the spin axis is along the length so as to maintain dynamic stability.
Why is your car jerk to the right in a left turn?
Because the momentum of your car is going straight and when you go left your car tries to stay in that straight direction.
If you are standing on an icy lake with no friction how do you get off?
You must discard something. Give something some momentum in one direction, and that gives the rest of you momentum in the opposite direction. - Turn your head left and exhale, then turn your head right and inhale, repeat until arrival at bank. - Throw something. Coat, keys, spit, etc. IF you have nothing, chew off a leg. Throwing something results in an equal momentum imparted to you in the opposite direction. If you threw something west, then you'd go east.
Will law of momentum also hold good if momentum is a scalar quantity?
Momentum is never scalar. Are you sure you phrased that right?
What causes a top to right itself when it spins?
Conservation of angular momentum means that the top will stay in the same orientation it was started in while spinning, which is not necessarily upright. Gyroscopes for instance can be started at an angle of 45o to the ground and will remain at that angle as long as they keep spinning.
Newton's third law states?
Newton's third law is..."For every action there is an equal and opposite reaction."This is probably the hardest law to really understand.It really helps to understand this law if you understand that the law has its origin in the conservation of momentum principle.The fact of the matter is, force can be most fundamentally understood to be the rate of change of momentum.Let me explain why.First momentum is..P=mvNow look at the equation for force.F=maIt is very similar except that in place of P we have F and in place of v we have a.Looking at the force equation again..f=mawe note that acceleration is the rate of change of velocity so...F=m dv/dtNow since the mass, m, is constant we can put it directly beside the velocity like so..F=d(mv)/dtThis is looking more like the below momentum equation...P=mvThe only difference is that for the momentum equation, we have, mv, and for the force equation we have the rate of change of, mv, or, d(mv)/dtNow in the force equationF=d(mv)/dtbecause P = mv, we can replace, mv with P...F=dP/dtAs I said, force is the rate of change of momentum.Now since the law of conservation of momentum states that momentum is neither created nor destroyed, if an object picks up momentum, another object to lose momentum. In Newton's third law the "action" force is the second body picking upmomentum and the "reaction" force is the first body losing that momentum.As an example, imagine two people standing on a very slippery skating rink, because they are standing still, together, they have zero momentum. If one person pushes the second person, or "applies a force" on the second person, the second person has momentum delivered to them and that second person picks up speed/momentum in that direction. The first person however picks up speed/momentum in the other direction, which means that he also had momentum delivered to him. That second person picking up momentum was the "action force", and that first person picking up momentum in the other direction was the "reaction force".The second person picked up momentum in one direction, and since there is the conservation of momentum law, the first picked up momentum in the opposite direction. Their momentum was zero before the event and since momentum has direction the sum of both momenta add up to zero after the event.If both people had been moving, for example, to the right and the first person pushed the second person also to the right, the second person would have picked up momentum to the right and the first person would have only lost momentum to the right. There would have still been both an action and a reaction force however because momentum was only exchanged.
What part of a right angle is an angular degree?
1/90?
