sometimes people say that water is removed from clothes in a spin dryer by centrifugal force throwing the wate

Question

sometimes people say that water is removed from clothes in a spin dryer by centrifugal force throwing the water outward. What is wrong with this statement?

Answer 1

Nothing. That is correct.

In a non-inertial reference frame (such as a spinning dryer), you experience pseudoforces due to the acceleration of the frame.

Examples of pseudoforces:

When your car accelerates, you (with your reference frame inside the accelerating car) feel thrown backward. Likewise, when the car brakes, you are thrown forward.

When a body moves a certain way in a rotating reference frame, its path is deflected by a pseudoforce called the Coriolis force.

And in a rotating reference frame like your spin-dryer, objects feel an outward pseudoforce, which we call the centrifugal force.

The important thing to remember is that these pseudoforces don't exist to an observer in an inertial reference frame who is outside the rotation. To him, it takes an INWARD centripetal force to keep something going in a circle. To him, the water that flies out is just obeying its inertial tendencies in the absence of enough inward force to keep it rotating.

Answer 2

Centrifugal force is a term which may refer to two different forces which are related to rotation. Both of them are oriented away from the axis of rotation, but the object on which they are exerted differs.
A real or "reactive" centrifugal force occurs in reaction to a centripetal acceleration acting on a mass. This centrifugal force is equal in magnitude to the centripetal force, directed away from the center of rotation, and is exerted by the rotating object upon the object which imposes the centripetal acceleration in accordance with Newton's Third Law of Motion. Although this sense was used by Isaac Newton,[1] it is only occasionally used in modern discussions.[2][3][4][5]
A pseudo or "fictitious" centrifugal force appears when a rotating reference frame is used for analysis. The (true) frame acceleration is substituted by a (fictitious) centrifugal force that is exerted on all objects, and directed away from the axis of rotation.
Both of the above can be easily observed in action for a passenger riding in a car. If a car swerves around a corner, a passenger's body seems to move towards the outer edge of the car and then pushes against the door.

In the reference frame that is rotating together with the car (a model which those inside the car will often find natural), it looks as if a force is pushing the passenger away from the center of the bend. This is a fictitious force--not an actual force exerted by any other object. The illusion occurs when the reference frame is the car, because that ignores the car's acceleration. A number of physicists treat it much as if it were a real force, as they find that it makes calculations simpler and gives correct results.

However, the force with which the passenger pushes against the door is real. That force is called a reaction force because it results from passive interaction with the car which actively pushes against the body. As it is directed outward, it is a centrifugal force. Note that this real centrifugal force does not appear until the person touches the body of the car (ignoring any force exerted by the seat on the person's body, etc). The car also exerts an equal but opposite force on the person, called "centripetal force".

Answer 3

If you want to be a purist about things, the REAL centrifugal force is holding the clothes inward, by the force exerted by the frame of the dryer. The water is extracted by inertia, because the water wants to travel in a linear motion while the clothes are traveling in a circular motion. However, this inertial drive is also commonly referred to as centrifugal force, so to say that anything is wrong with that statement is specious.

Answer 4

The technical error is calling in calling it a force, when it should be described as a pseudoforce since. It only appears as a body force in a noninertial reference frame. Newtonian forces are only defined in an inertial reference frame. A more technically correct statement would be that the clothes dry in part (evaporation contributes too) due to the centripetal (note spelling) force causing the water to stick to the clothes (due to surface tension) cannot maintain the centripetal acceleration due to the spinning. That's usually too much of a mouthful to utter, however, even for people who know better.

Answer 5

its the centrifugal tension that does the interest. At sucha severe speed the water from the fabric is pushed in an outward direction using rotation that leaves the fabric water loose.

Answer 6

Nothing wrong,
Try this example,

Take a handerkerchief, soak with water, hold one corner of hanky in yhour hand and let loose the other three corners. Now rotate your hamnd as if to spin the hanky, You will see water will be oozing out of your hanky and some watery drops sprinkles on your face too. Now you will be able to understand. Right.

Answer 7

spin dryers.. dont dryers use heat,,more centrifugal force is used in a washing machine than a dryer