Lab 5 Assignment Mirza

8/20/2019 Lab 5 Assignment Mirza

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INDUS UNIVERSITY

B.S Textile EveningSemester !"

Assignment !1

Textile #e$%ani$s

#ir&a U'ai( Baig



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T* Determine t%e +*,e--i$ient *- Stati$ ri$ti*n *- a a'ri$ *n a/*ri&*ntal Stainless Steel Plane

Per-*rman$e 0'e$tive

Upon successful completion of this experiment the student will be able to:

i) Understand what is friction and its behaviour.ii) Measure co-efficient of friction on a horizontal plane.iii) Have clear concept of the static friction between two contacting surfaces.

A22arat3s

Horizontal Stainless Steel Surface with a frictionless pulle! "ooden #loc$! %iece of string! &abric to be tested! "eighing %an and "eight #ox.

Dis$3ssi*n 4 T%e*r

'he friction is the force that opposes the motion or tendenc of motion of an ob(ectwhen the ob(ect is an contact with another ob(ect or surface. &riction is essential for various holding and fastening devices as well as for friction drives and bra$es andeven for suppling the traction for wal$ing or driving automobiles. t has somedisadvantages also* it causes lose of power and + or wear.



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'he magnitude of the frictional force F is directl proportional to the magnitude of theresultant normal force N. 'he resultant normal force is a contacting force because ofwhich to surface are in contact. "hen the contact of two surface is horizontal! themagnitude of the normal force is e,ual to the weight of upper bod. &ig . illustratesthe contact of two surface horizontall.

F ~ N

Or F = µ N

Where µ = Co-efficient of friction

'he co-efficient of static friction between two stationar surfaces is defined as theratio of limiting frictional force of resistance opposing their relative motion to theforce! measured perpendicular to the common point or plane of contact! pressing thetwo together:

µ = F / N

Pr*$e(3re 4 #et%*(

. /over the wooden bloc$ with the fabric on be tested in such a wa that thesurface of fabric must be free from crease and weigh it. 'he magnitude ofits weight is e,ual to the magnitude of normal force N.

0. %lace the wooden bloc$ on the horizontal stainless steel surface attach thestring on one side of wooden bloc$! pass it over pulle and attach a weighingpan on the other end of the other end of the string as show in &ig..0.

1. 2ow place some weight on the weighing pan.3. 4fter placing some weight chec$ friction of fabric surface on the horizontal

stainless steel surface b taping.. f wooden bloc$ moves b taping then note the magnitude of force exerted b

total weight of weighing pan 5 i.e. the magnitude of limiting frictional force &)and the magnitude of resultant normal force 2 5 i.e the magnitude of totalweight exerted on stainless steel surface b wooden bloc$).

6. /alculate the co-efficient of static friction b using e,uation ..7. 8epeat above procedure five times b increasing the weight of wooden bloc$.9. /alculate the average co-efficient of static friction.



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+al$3lati*n

/o-efficient of static friction ; & + 2

4verage ; <;+n! where n is number of observations

Test Re2*rt 4 Res3lt

. &abric Specifications0. 8esultant 2ormal &orce.6. &rictional &orce.". /o-efficient of static friction.5. 4verage /o-efficient of friction.

a'ri$ S2e$i-i$ati*n

i) Material 5&iber)ii) /onstructioniii) /ondition 5=re + 'reated + >ed + %rinted + &inished)

f finished! specif tpe of finish.

?bservation2o.

2ormal &orce 252ewton@s)

&rictional &orce &52ewton@s)

/o-efficient of static friction &+2

A.70 1.16 A.70 + 1.16 A.00

0

1

3

Average 7 8

Revie9 :3esti*ns

. "hat do understand b static friction and $inetic frictionB

'he functional force between two surface exeting its maximum abilit is $nown asstatic frictional force present between moving ob(ect C the surface is $nown as D.E



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Lab 5 Assignment Mirza