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An uncorrected basic AC squirrel cage induction motor will start equally well in either direction. More expensive motors have what is known as a 'shaded pole' which encourages the motor to always turn in one direction. Some ceiling fans have a reverse operation selectable on another switch.
An alternate answer
I can't tell you what would cause the blades to change directions but I can tell you how to change it back (Assuming you mean a ceiling fan). If you have a remote with your fan, 9/10 times there is a button on the remote to change the direction the fan is spinning. If you don't have a remote, do this:
1) Turn your fan on.
2) Turn it on the lowest, slowest setting.
3) Just reach up there, and stop the fan.
4) Spin the fan swiftly in the direction you want it to spin in, and it will reset and adapt to the direction you spun it in.
What else can I help you with?
What would cause shoulder blades to pop out of place?
There are quite a few different things that could cause shoulder blades to pop out of place. Car accidents could cause this.
Which two problems would cause the remote installations to fail?
dont do the directions corectly, you can do the directions more than once
How you know when to change lawn mower blades?
Not necessarily when to change; but when to sharpen mower blades: The easiest way to know is by observing the way the grass is cut. A sharp blade will make a "clean cut" on the grass blades, whereas a dull blade will "tear" the grass and leave a "ragged" appearance. As far as when to change out the blades, there is no set time interval, you just have to visually evaluate the condition of the blade (bent, badly worn, warped, etc.) to determine when to change. If your mower uses 2 blades, it would be wise to change both blades at the same time.
What would cause wiper blades to collide on a 2000 Plymouth voyager van?
Bent or misinstalled wiper arms.
What is forces that cause a change in motion?
ANY force can cause a change in motion, as long as the sum of all the forces acting on an object is non-zero. For example, if two people pull on an object in opposite directions, and with forces that have the same magnitude, then the sum of the forces would be zero, and the object won't accelerate.
What are some other reasons to follow directions?
well imagine that we had no rules the world would be cause
What would you have to change to live on planet Mercury?
you would have to change its place cause we would all burn cause its right next to the sun.
Is natural selection a cause of speciation?
Yes. Without natural selection there might probably still be change, but it would produce a fine gradient of diverging morphologies in every 'direction' of change. Natural selection limits the 'directions' of change, thereby producing distinct morphologies and thus distinct species.
Where is the greatest change in direction in the eastern part of the country?
This would be in the central east. The wind will change directions by a large amount in this area of the country.
What would happen if two spaceships travelling in opposite directions at the speed of light ran straight into each other?
it would cause a explosion and everyone would die
What change in the stream would cause pebbles to be deposited farther offshore?
A greater volume of water would cause this.
A very small tilt in Earth'sare axis would likely cause .?
That would most likely cause a very small change in the seasons.
