## Rotation

Parent Category: Mechanics
Classical mechanics doesn't just describe how an object's position behaves under external influences, but also how its orientation behaves. Using the same principles found in Newtonian mechanics, laws and relations governing rotation can also be derived. Please direct all your questions about moments of inertia, angular velocity, angular momentum, centripetal force, centrifugal force, torque, and spin here.
It isn't an object which can be found of itself, but objectspossessing angular momentum are those which are turning.
Assuming that "r" is the radius, that simply isn't sufficientinformation to calculate angular velocity.
The dimension of angular velocity is reciprocal time . . . 1 / time or T -1 . It'll be stated as "some angle" per "unit of time", like "45 revolutions per minute", and angles are dimensionless.
no because to get a torque you must multiply lever arm by force. If lever is zero, then torque is zero
Angular momentum = r x p... That is position vector r, CROSSED (notmultiplied) with momentum vector p. So, to find out the directionthe angular momentum will act, take ur right hand, point yourfingers in the direction of r, and "curl" (close/bend whatever uwanna call it) ur FINGERS (not thumb)...
In any circular movement, including driving in a curve, thecentripetal force (and the corresponding centrifugal force, whichis often considered a "fictitious force") will increase: * When the speed increases * When the radius of curvature decreases
You can calculate the centripetal ACCELERATION with one of theseformulae: acceleration = velocity squared / radius acceleration = omega squared x radius Acceleration refers to the magnitude of the acceleration; thedirection is towards the center. Omega is the angular speed, in radians per second. To...
Usually you would use some fact you know about the physical system,and then write an equation that states that the total angularmomentum "before" = the total angular momentum "after" some event.
Total angular momentum is always conserved - there is no way youcan violate that law. So, the answer is yes.
In a perpendicular direction to the rotating body.
The relationship between those four can be found from using the original centripetal force equation, Fc = (mv 2 )/r . Since we know v=d/t , we can sub that into the equation to get Fc=(md 2 )/(rT 2 ) , where T is actually the period. Now, we know the distance it travels is...
Angular momentum is maintained in such a case - and in fact in all cases, unless angular momentum is transferred to, or from, another body. This means it must rotate faster. Angular momentum is maintained in such a case - and in fact in all cases, unless angular momentum is transferred to, or from,...
Rotational inertia is sometimes called spin. It involves the movement of a mass around an axis. This moving mass will have some measure of kinetic energy that is due to the fact that it is spinning. The variables are the shape and the mass of the object, the way the mass is distributed within the...
Up out of the north pole. (And down into the south pole.)
The Earth rotates in 1 day. The moon takes 27.32 days to rotate.
if large force is applied keeping the minimum moment arm then it produces a very small torque or even no torque.
By applying the same force farther from the center of rotation.
Axis of rotation is an imaginary line about which a turning body rotates. Or the center around something rotates.
say your mass (m) is 100 kg velocity (v) at equator = 40 030 000 / 86164 = 464.6 metres / sec earth radius(r) = 6 371 000 metres acceleration due to gravity at earths surface (g) = 9.82 (m/s)/s . gravity force at earth surface ( f = m * g) = 100 * 9.82 = 982 newtons . centripetal...
Centripetal force always points to the center of a circle. Gravity is a centripetal force because it all leads to the center of the Earth. When you throw a baseball on Earth, the baseball won't go very far because gravity is pulling it down.
Usually angles are measured in degrees, 360 degrees being full circle. There are also radians, full circle being 2 x PI
If you take any energy off of the wheel, then it won't spin at 5RPM any more. And if you keep taking energy from it, then pretty soon it'll stopspinning. You can get just as much energy out of it as it took to spin it upto 5 RPM.
The lowercase Greek letter "omega" is often used - it looks like a rounded "w". (When this symbol is used, angular velocity is usually specified in radians per second.) The lowercase Greek letter "omega" is often used - it looks like a rounded "w". (When this symbol is used, angular velocity is...
( Any unit of length ) x ( any unit offorce ) is a perfectly good unit of torque. You may need to use a few conversion factors if you want it to worktogether with anybody else's normal system of units, but it definitely hasdimensions of torque.
This is a fascinating thing to think about (Captain). -- It's easy to travel faster than the Earth can spin. You do that every time you walk toward the East. Because if you just standstill, you're already traveling East exactly as fast as the Earth isspinning. -- So yes. If you leave home and...
Momentum is the product of mass and velocity p=mv. Torque is vector energy T=fxd=fdsin(fd), the vector analogy of scalar energy, work W=f.d= -fdcos(fd).
Its Not the second law but the third law which says 'for every action there is an opposite and equal reaction.' Torque reaction is observed in helicopters motion. As the main motor rotates (that is the wings on the top), the helicopter itself tries to rotate(the opposite direction) in order to give...
velocity= time / displacement velocity also includes directions ex: 10 m/s due north (this would be the displacement.) Velocity is how fast an object is going WITH DIRECTION. The S unit for velocity is m/s with direction . Ex. v= 120 miles south / 3 hrs. v= 40 mi/hr SOUTH . ...
The term "torque" is used specifically for circular motion. For a difference, torque and force have different dimensions. Torque has the dimensions of force x distance. This is because you can increase the torque both by applying more force, or by increasing distance from the axis of rotation, of...
-- If all the forces on a planet were balanced, then the planetwould move in a straight line with constant speed, not in a curved path. So theforces on it must be unbalanced. -- That's easy to understand when you consider that there's onlyone force on the planet ... the force of gravity that...
When an object rolls the center of gravity (or of geometry - or both depending on the shape of the object) translates (moves) along a path and there is a point of contact with a surface on the perimeter of the object, rotation (angular change) does occur too. During rotation the center of...
London eye, wheel etc... wheels of bicycle washing machine or a spin dryer
A centripetal force is, by definition, a force that makes a body follow a curved path. So, yes, a centripetal force causes rotation about a point in space.
no, but rotation can produce centripetal force
no angular acceleration is not producd by torque is a factor of torque T= anguar aceleration X momentum I say yes, because torque is another word for a couple that is equivalent to two equal parallel forces in opposite directions but separated by a distance. Torque acting on an inertia produces...
You could have 'newton-centimeters', or 'newton-inches', or 'poundmeters' etc., but you can't have 'newton pounds'. Torque is (a distance) x (a force), but 'newton pound' is (force) x(force). Whether or not that has any physical significance at all, it'ssurely not torque.
Torque is the combination of perpendicular distance and weight; it is not a true force
Second hand . . . 360 degrees per minute Minute hand . . . 360 degrees per hour Hour hand . . . 360 degrees per 12 hours = 30degrees per hour
Anything that moves in a circle.
the force which lies in the center of the gravity
When two forces acting on the same wheel are equal and opposite but applied at different points on the rim.
The torque required to run a nut down a thread on certain types of nuts designed to resist vibration loosening. The resistance can be provided by a plastic insert or a noncircular head.
When a top spins, there is a little bit of work being done: The top attempts to maintiain a conservation of angular momentum, which is why as the top slows, it tends to wander more and more across the table.
Because torque is (magnitude of the force) x (distance between thepoint where the force is applied and the center of rotation). Gravitational force is always directed toward the center ofrotation, so the second factor is zero, and the torque is therefore zero.
By radial force, we can assume you mean centripetal force Centripetal force = (Mass)(Radius)(Angular velocity) 2
There are 4 bolts that hold the seat on that need to come off. First, you'll need a Phillips head screwdriver to remove two plastic panels, one of which is by the gear shift lever, and the other by the carb. With these panels removed, you'll have access to the front two (10MM) seat bolts. The one on...
Of course. Torque is the product of the (force) times (its distancefrom the axle). If the force you have doesn't produce enough torque, you simplyapply the same force farther from the axle, and that increases the torque. That's why, if you can't crack the nut with the wrench you have andthe...
speed= distance per seconds & torque= revolution per seconds
Angular momentum is the moment of momentum, a conserved vector quantity used to state the overall condition of a physical system.
Usually radians per second. Any unit is appropriate, if it consists of (a unit of angle) divided by (a unit of time)
Angular momentum is always conserved, just like linear momentum isalways conserved. Initial angular momentum = Final angular momentum Angular momentum = moment of inertia * angular velocity Initial moment of inertia * initial angular velocity = Final momentof inertia * Final angular velocity In...
It's (pi x RPM) / 30 radians per second.
Yes, it happens in a motor
No. Friction is a function of Normal Force and the friction coefficient, nothing else.
The two forces will produce the same torque if : R1xF1 = R2xF2; r1f1sin(R1F1) = r2f2sin(R2F2). The magnitude of the forces can be the same (f1=f2=f) but their angles with the the displacement (R) can be different, r1fsin(R1F1) = r2fsin(R2F2),and the torque will be the same. Torque is the vector...
The torque from the force, T = r X F = .2m*40N*sin(90 o ) = 8Nm. The angular acceleration, A = (w-0)/t = 10/4 = 2.5rad/s 2 . As, T = IA, then I = T/A, so I = 8Nm/2.5rad/s 2 . = 3.2 kgm 2 .
Centrifugal force isn't actually a force. It is an effect caused by a centripetal force. Sat for example you are on a roundabout at a park spinning - the centripetal force constraining you in circular motion is the tension in your arms, gripping the bar at the center - the force is towards the...
It means to turn it without it going in a complete circle
Audio CD players read their discs at a precise, constant rate( 4.3218 Mbit/s of raw physical data for 1.4112 Mbit/s (180.6 kB/s)of usable audio data) and thus must vary the disc's rotational speed from 8 Hz ( 480 rpm ) when reading at the innermost edge, to 3.5 Hz ( 210rpm ) at the outer edge....
There are some either way, of course there is no up or down in space so any galaxy that spins one way from above spins the other way from below.
Because the object never moves in the direction of the force. Sothe product of (force) times (distance) is zero, and F x D is thedefinition of work.
Centrifugal force doesn't exist, and there is no outward forceacting on planets. The only force on them is the 'centripetal' one ... thegravitational force between each planet and the sun, that attracts the planet inthe direction toward the sun. That's the only force required to keep aplanet in...
Yes, by golly, it is.
The clothes have a centripetal force (the walls of the machine provide this) which pushes them towards the center of the tub, not out of it. But the water lacks a centripetal force (it fits through the holes in the walls of the wash tub) to keep it from leaving the path of circular motion, so...
\n Breakaway torque is the torque required to start the initial movement, in the loosening direction, of a bolt, screw, or nut from its (nonâloaded) at rest position with the locking element engaged. \n \n Tightening torque is the torque necessary to move the bolt, screw, or nut along its...
If your talking about NFL then We spin footballs to minimize the effect of air resistance on the ball. That makes it go further and follow a more straight path. Its got something to do with angular momentum
electric motors produce torque so in the sense yes
Yes, use the force you must.
The spin is forced on to the bullet or shell by grooves in the gun barrel, this is to take advantage of the fact that the axis of a rotating object will tend to remain parallel, this , in effect keeps the shell or bullet in a good aerodynamic profile, without tumbling (which absorbs energy). These...
a = v^2/r . r = 0.25 metres v = ((0.25 * 2 * pi * 20) / 60) = 0.5236 metres / sec so: a = (0.5236^2) / 0.25 . a = 1.097 (m/s)/s
Anything spinning at a constant rate (even if the rate of spin iszero).
Muscles produce forces by contacting their length. Forces can be turned into torques through the action of joints as pivots and bones as levers.
Yes, angular velocity is a vector quantity
yeah,bcoz it moves in circle around a specific point.
With that amount of information, you can't. You'd also need to knowwhat effect that torque had on the object ... things like how its rate ofrotation changed, its shape (so that you could determine its moment of intertia),etc. In other words, in addition to the net torque on the object, youalso need...
23 hours 56 minutes and about4 seconds
torque = force * lever length torque = 15 * 55 torque = 825 n-cms
Centripetal force is a force that makes a body follow a curved path: it is always directed orthogonal to the velocity of the body, toward the instantaneous center of curvature of the path. I linked my source.
a = v^2 / r where: a = centripetal acceleration ((metres / second) / second) v = orbital velocity (metres/second) r = orbital radius from earth centre of gravity (metres)
Torque is the tendency of a force to rotate the body to which it is applied.Torque is always specified with regard to the axis of rotation. It is equal to the magnitude of the component of the force lying in the plane perpendicular to the axis of rotation, multiplied by the shortest distance between...
It could be, but it's not necessarily.