Friction-
Friction is the force that tries to stop the motion of the body. Friction in the force that is generated when a body is sliding over another body. Now today we are going to talk about the application of friction. The force of friction is unwanted thing in case of any types of construction.
When we place a block on the surface, and if we apply the force on the bottom of the block. The block will try to move in forward direction. There is an opposite and opposing force present between the block and the surface that will try to restrict the movement of the block, that force is known as force of friction.
Weight = (W)
Angel of inclination = ($ )
Reaction of box = ( R)
Force of Friction = (F)
Coefficient of friction = (Cf)
Force of friction (F) = (Cf) * Reaction
F = (Cf) * R
Types of Friction-
There are two types of friction, first one is static friction and second one is dynamic friction.
I) Static Friction
Whenever the body is under the condition of eqillbrium or rest , the body experiencing a force of Friction on that time is considered as the static friction.
The static friction is the friction, that is experienced by the body when it is in condition of rest the static.
ii) Dynamic Friction
The dynamic friction is the friction that is experienced by the body when the body is in condition of motion, that friction is also known as kinetic friction. There are two types of dynamic friction, first one is sliding friction and second one is rolling friction. When one body slides over the another body then the friction generated between the both the bodies is known as sliding friction. When the body roll over the another body then the friction generated between the two bodies is known as a rolling friction.
Numerical on friction
A box having weight of 250 N is putting on surface of the table. The coefficient of friction is 0.3. Find value of the force, which may be able to move the box, while acting at angle of ( 30 ) with the horizontal surface.
Solution -
Given, weight (W)= 250 N
coefficient of friction (Cf) = 0.3
Angel of inclination = ($) = ( 35)
Force of Friction = (F)
Let, Force which is able to move box =( Fr)
Reaction of box = ( R)
Reaction to the box (R ) = weight of box (W)
By resolving the force in x- axis,
F = Fr * Cos ($ )
= Fr * Cos (30 )
= (0 .866 ) Fr
_______ equation (1)
By resolving the force in y- axis,
R = W - Fr * (Sin $ )
= W - Fr * (Sin 30 )
= 250 - Fr *(0 .5). _______ equation (2)
Also we know that
Force of friction (F) = (Cf) * reaction
F = (Cf)* R
Using equation 1 & 2,
(0 .866 ) Fr = (Cf) * {250 - Fr * (0 .5)}
(0 .866 ) Fr = ( .3) * {250 - Fr * (0 .5)}
By solving the equation , we get
Fr = 73 N (Ans)
Law of Friction -
The law of friction states that the friction does not depend upon the area of contact between the body and the surface. It depends upon the roughness of surface. The force of friction is equal to the force generated by the body in the perpendicular direction. In other word, we can say that the force of friction is equal to the normal reaction of the body that is perpendicular to the surface .
Application of Friction -
Generally the force of friction is considered to be unwanted thing. The friction is considered as the force which is not required in our day to day life. There are various applications of friction. First one is the friction can be used in ladder to climb on the ladder.
1) Ladder Friction -
In case of ladder friction, the friction helps to climb up on the ladder from bottom to the roof of the room. Due to the ladder, there is normal reaction acting on the ladder by the wall. The normal reaction is also generated near the bottom of the ladder.
F1 = frictional force at bottom of ladder,
F2 = frictional force at top of ladder,
R1 = Normal reaction between the ladder and floor, it is present at bottom of ladder,
R2 = Normal reaction between ladder and wall , it is present at the top of ladder,
2) Screw Friction -
Second use of the friction is screw friction. In case of the screw friction, the object lifted with the help of the screw.
3) Wedge Friction -
The third use or application of frictional force is wedge friction. Wedge is also the example of the use of the friction. Actually the wedge is the triangular shape object. Wedge is the object which can be used in putting the heavy object in correct position. It can be also used to lift the object.
the body is having weight as (W).
Force tries to lift the body in upward direction is shown as ( F ).
The force of Friction depends on the roughness of the surface on which the body is moving. If the surface of the body is more rough, then the magnitude of the force of friction is considerably more than the other surface, which is less rough.
System of force - Force is the external agency that tries to change the respective dimensions of the object. There are two different things, first one is magnitude and second one is the direction. Force is expressed in terms of magnitude and direction. On accounting it's definition, it is the external agent responsible for change of the respective dimensions of the body. Generally the direction of force illustrates the details of different directions of the body, where the force is applied. The direction of the force awakens the way by which the body is deformed.
If the line of action of two or more forces are on the same plane then it is known as the Coplanar forces. If the line of action of two forces are parallel to each other, then there are known as parallel forces. If the line of action of more than one force is on the same line, then that system of forces is called Collinear forces. The force which is produced due to the surface between the two body, is called the contact force. There are many more types of contact force force -1) Muscular force 2) Frictional forces. There are many more types of non- contact force force -
1)Gravitational force
2) Magnetic forces
The force which is produced due to the non - surface between the two body, is called the contact force.
The influences of the force -
1) The force can easily change the direction of the body having some motion in it.
2) The force can stop the body by the application of the force on the body.
3) The force helps to change the speed of the body, which is having some motion in it.
4) The force can easily change the state of the body.
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