PHYSICS CLASS ACTIVITY

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PHYSICS CLASS ACTIVITY
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C.A. 7 Determination of the Coefficient of
Friction
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FRICTION

• FORCE EXERTED BY ONE SURFACE ON ANOTHER
• STATIC FRICTION FORCE WHICH PREVENTS MOTION OF
  TWO OBJECTS IN CONTACT
• KINETIC FRICTION FORCE WHICH OPPOSES THE MOTION
  OF TWO OBJECTS IN CONTACT

fs
fk
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C.A.7 FRICTION
N
V constant
P
Ff
W
a 0
F net 0
SF 0
SFy 0
SFx 0
up down
left right
N W
Ff P
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C.A.7 FRICTION
V constant
P1
2
W1
2
a 0
F net 0
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C.A.7 FRICTION
Ff a N
Ff P
P a W
N W
(RUB HANDS)
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KINETIC FRICTION
m
Ff
CONSTANT
N
m coefficient of friction
Ff mN
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m
FELINE
MOO
MEW
BOVINE
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m coefficient of friction
Ff a m
If Ff 0 then m0
m a stickiness
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m coefficient of friction values
m kinetic
m static
gt
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mk BY A DIFFERENT METHOD
Ff mN
SF 0
y
SFx 0
fk
SFy 0
N
left right
up down
m
fk mgx
N mgy
mgcosQ
V constant
mg
a
mgy
x
mgx
a
mgsinQ