give example to show that friction is both a friend and a foe?

friction, u can say izz a necessary evil....

its a frnd in tha manner that all the things in tis world r moving only due 2 friction.. we r able 2 walk on the ground only due 2 the reason that it izz the friction that keeps our feet stick 2 the ground n hence push us forward.... same does happens while we sit or lay down or drive our car... in its absence we cud not have even be at rest n wud be movin forever in once pushed...

itz a foe in tis manner that it causes a slow didintegreation of things due 2 drag..... it izz a major problem for spacecrafts 'coz while reentering the earths atmosphere, the friction of air makes it drag by n hence creates so much heat which can easily damage the spacecraft n b perilous.... the retardation n fast consumption of vehicles izz also due 2 the friction provided by the roads n air....

i do hope that u gat what u needed but still further queries r most welcome...!!!!!

have a gud nyt...!!!!!

bye...!!!!

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i am sorry... the 6th line, 12th word reads as disintegration not didintegreation....

i am sorry 4 the fault...

byeee...!!!!!

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 friction is as our friend because :

Friction plays a vital role in our daily life. Without friction we are handicap.
1. It is becomes difficult to walk on a slippery road due to low friction. When we move on ice, it  becomes difficult to walk due to low friction of ice.
2. We can not fix nail in the wood or wall if there is no friction. It is friction which holds the nail.
3. A horse can not pull a cart unless friction furnishes him a secure Foothold.                                      4. without friction we can not write because a pencil writes by the friction between its tip and paper .

 

friction as our foe :

1. The main disadvantage of friction is that it produces heat in various parts of machines. In this way  some useful energy is wasted as heat energy.
2. Due to friction we have to exert more power in machines.
3. It opposes the motion. 
4. Due to friction, noise is also produced in machines.
5. Due to friction, engines of automobiles consume more fuel which is a money loss. ........................

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advantages of friction-

we can walk  ezyly  on dry surface , we can  write  on  black  board  nd  paper , moving  of  cycle  can  be  stoped  by  aplying break by  rubbing  matchbox  over fire  it  cathes  fire

disadvanteges -

due 2 excess  friction -

efficiency  of  machine will  decrease , heat  can  be  produced  during  excess  friction for  which  der  is  wastege  of  energy , A compromise is needed between much friction and not enough.
For example, if you wanted to slide a heavy box across the floor, you would want to reduce the friction between the box and the floor, so that it would be easy to move. Lubrication of some sort is often a way to reduce friction. 
 

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 very nice answers ......................!!!!! hats off .........

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friction is a friend as it helps us to walk n friction is foe when it wears out soles of shoes, ball bearings etc.

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Friction allows us to walk and to do various things like writiing, etc

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 it is foe cause it causes wear and tear in machines

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 helpfull answer. 10q

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i love you

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friction is good for us

and foe for us

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 friction is friend because it gives grip to us in the shoe we can see grooves in the shoe. eg- at play-offs (c.s.k vs m.i) dwayne bravo hit six ,he slipped but he managed to escape  because of his grooves of the shoe.

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  1.  friction is friend because it gives grip to us in the shoe we can see grooves in the shoe. eg- at play-offs (c.s.k vs m.i) dwayne bravo hit six ,he slipped but he managed to escape because of his grooves of the shoe.
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Friction is a friend because -
· It allows us to walk comfortably.
· It allows us to grip and catch other objects.
· Things do not move from their places because of the friction.
· Speeds of moving objects can be controlled due to friction only.
Friction is a foe because -
· It causes wear and tear in objects of our daily use including machines.
· It makes movement of heavy objects very difficult.
· We need to spend a lot of time and money for the maintenance of various machines in order to keep their friction low.  
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friction is a big foe isn't it

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 friction is foe because our shoes soles ear out uf that

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Lets look at friction and how it can affect our training. Friction is defined as - (1) A rubbing of one object or substance against another. (2) The resistance to motion of moving surfaces that touch.When working with machines friction can become a problem, you have the situation of weight on the machine plus friction making it feel much heavier than the weight stack says it is. This can wreck your progression, let's say you're going along on lat pulldowns, last workout you made over 10 reps, you add 5lbs and start to pull and nothing happens, a big yank gets the weight moving and you have to use excessive momentum to keep it moving, all this cheating still only gets you 4 reps. You wonder "what's wrong?", friction that's what. Each time you use a machine, you should inspect in for any loose nuts and bolts, frayed cables, stuck pulleys or any broken plates on the weight stack. Any of these can cause you problems with friction. Also you should regularly keep machines oiled and otherwise well maintained.There is another kind of friction I'd like to talk about, and that is the friction within your own body, yes, of course your body has it's own friction, and this gives us 3 levels of strength:1) Positive strength - contracting your muscles to lift or pull a weight, during this phase you are working against your own bodies friction.2) Holding strength - contracting your muscles to Keep a weight in one position, you are aided by your bodies friction here and can thus hold 20% more then you can lift.3) Negative strength - lengthening your muscles to lower a weight, you are also aided in phase by friction and it has been found that most trainees can lower 40% more then they can lift.This would mean that if your max on the bench press was 200lbs, that you could hold 240lbs and lower 280lbs. Research done by Nautilus in the 1970's showed that any increase in positive or negative strength would result in an increase in the other, of course, skill is also a factor. Now all this is very interesting. But, can it help us to build larger and stronger muscles? Yes, it can, let's take a look at some of the techniques that can come from this.If your lowering strength is 40% more then your lifting strength, but you use the same weight for both then you will not be really be taxing your negative strength. We must find a way to make the negative harder, there are many ways to do this. One way is to do some of your exercises on Life Circuit machines they automatically make the negative 40% heavier then the positive, while these machines are good I feel they can be improved on due to a perceived lack of resistance during the change from positive to negative and then back again. Another way would be for your training partner to grab the bar and push down what he approximates to be 40% of what your lifting, have him do this on each negative of the set. And for safety have him have a good hold on the bar while doing this and make sure he's ready to stop pushing and Start pulling, in case you for some reason lose control of the weight. You can also try it this way, (use only a universal type machine for this, because you couldn't balance a barbell for this technique.) take a weight that's about 50% of what you usually use lift it with both arms and then lower it with your right arm only, lift it again with both arms and now lower it with your left arm only, continue to alternate the lowering arm till you make you target reps or until you can no longer lift the weight with both arms.Other techniques would involve training the holding and lowering phases totally separate from the lifting phase. When doing this you would need at least two very strong training partners to lift the weight for you while you try to hold it in place as long as you can (a good position would be the sticking point for that particular lift), or you have them lift in up and then you lower it slowly and under control and they lift it again and then you lower it again, repeat for you target reps or till you can keep the bar moving slowly and controlled. Again for safety, your training partners should keep their hands on the bar and be ready to take the weight if you should lose control. You would also want to work gradually up to the really heavy poundage's.These techniques will raise the intensity of you workouts and if used properly can help you reach new levels of size and strength.

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friend:friction help us to walk.
foe:after sometime soles of our shoes disappeared this is due to frictionwhich can be dangerous.
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car breaks
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recall now some of your experiences. is it easier to hold a earthen pot or a glass tumbler ?suppose the outer surface of the tumbler is greasy or has a film of cooking oil on it ;would it become easier or more difficult to hold it? just think: would it be possible to hold the glass at all if there is no friction?
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Hahahaha
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*If friction would not b there v could slip over a surface at each time on every attempt.
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* forest fires r caused due to friction btwn branches of trees rubbing against each ather.
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As a friend : It helps us to walk on a road without slippery As a foe : It wears out the sole of the shoes due to friction
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See this answer

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Because without it we will not be able to walk and foe because it causes tear of tyres
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FRICTION IS A FRIEND AS IT HELPS IT VARIOUS WORKS AND FOE AS IT CAN BE VERY DANGEROUS
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Friction as friends. -(1) We are able to walk because of friction. (2) We are able to write because of friction. Friction as foe. (1) It causes bear - tear of moving parts. (2) Friction between the differeny parts of machine produces heat . This can damage the machine
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Examples of friction as a friend:

  1. We are able to walk because of frictional forces between ground and our feet.
  2. We are able to write because of friction between ball point and the paper surface.
  3. nails and screws stick to the wall surfaces because of friction.
  4. Lighting a match stick is because of friction between match stick and the side surface of the match box.

Examples of friction as a foe:

  1. Wear and tear of soles of our shoes is due to friction.
  2. When a tyre deflates, it is difficult to move the vehicle because of increased friction between the tyre and the road surface.
  3. Machines get heated up and produce noise because of friction.
  4. Due to friction, machines and vehicles consume more fuel and increase maintenance cost.
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Examples of friction as a friend:

  1. We are able to walk because of frictional forces between ground and our feet.
  2. We are able to write because of friction between ball point and the paper surface.
  3. nails and screws stick to the wall surfaces because of friction.
  4. Lighting a match stick is because of friction between match stick and the side surface of the match box.

Examples of friction as a foe:

  1. Wear and tear of soles of our shoes is due to friction.
  2. When a tyre deflates, it is difficult to move the vehicle because of increased friction between the tyre and the road surface.
  3. Machines get heated up and produce noise because of friction.
  4. Due to friction, machines and vehicles consume more fuel and increase maintenance cost.
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Friction is both our freind and foe as it is both useful and also in some case disadventageous.
For example :-

 ADVANTAGES OF FRICTION :-
1)  It helps us to write.
2)  It helps us to walk.
3)  It helps us to hamer a nail4)  It helps us to light up a match stick
ETC.......

DISADVANTAGES OF FRICTION :-
1)  Wastage of energy
2)  Production of unwanted sound
3)  Production of unwanted heat
ETC...
THUS, friction is both our  freind and foe
 
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It helps to increase the friction between the ground and our foot so that we can walk so it is a friend.also it works out the shoes when we use them for a lo ger period of time time so it is a foe also.
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