FRICTION

REVISION

FRICTION

REVISION

f = µRN f - Friction Forceµ - Coefficient of FrictionRN - Normal Reaction Force

HORIZONTAL AXIS

P

Pf

RN

P

fP

RN

+ Σfy = 0RN – W = 0 ……… W =mgRN = mg

1

+ Σfx = 0P – f = 0 P = f

+ Σfx = 0f –P= 0 P = f

OR

2

P

Pf

RN

+VE

- VE

REVISION

INCLINE SURFACE (SATAH CONDONG)

CASE -1) UP2) DOWN3) RESILIENT FROM SLIDE4)ADDITIONAL FORCE

REVISION

INCLINED PLANEAngle of repose is the maximum angle of inclination relative to the horizontal to prevent sliding.

Angle of friction tan = m

W = mg

q

RN

RN

W

f

P

θ

+VE

-VE

y

x

REVISION

INCLINED PLANE

RN

f

P

CASE 1 : UP

REVISION

RN

P

f

CASE 2 : DOWN

INCLINED PLANEREVISION

RN

f

P

CASE 3 : RESILIENT FROM SLIDE

INCLINED PLANEREVISION

RN

f

RN

f

P

CASE 4 : ADDITIONAL FORCE

INCLINED PLANEREVISION

RN

f

i) Force acting to the incline surfaceE.g ; Force acting 75° to the inclineθ = 40°So,

Additional Force

RN

f

ii) Force acting to the plane surfaceE.g ; Force acting 75° to the plane surfaceθ = 40°So,

Additional Force

Efficiency , =Daya Tanpa Geseran (D.T.G)

Daya dgn Geseran (D.G)

Minimum Force, P = W sin (+θ) ……. = θ

Minimum Horizontal Force, P = W tan (+θ) …... = θ