C'A'

1
C.A. 7 Determination of the Coefficient of
Friction
2
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
3
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
4
C.A.7 FRICTION
V constant
P1
2
W1
2
a 0
F net 0
5
C.A.7 FRICTION
Ff a N
Ff P
P a W
N W
(RUB HANDS)
6
KINETIC FRICTION
m
Ff
CONSTANT
N
m coefficient of friction
Ff mN
7
m
FELINE
MOO
MEW
BOVINE
8
m coefficient of friction
Ff a m
If Ff 0 then m0
m a stickiness
9
m coefficient of friction values
m kinetic
m static
gt
10
mk BY A DIFFERENT METHOD
Ff mN
SF 0
y
SFx 0
fk
SFy 0
N
left right
up down
m
Ff P
N W
mgcosQ
V constant
mg
a
mgy
x
mgx
a
mgsinQ
11
mk BY A DIFFERENT METHOD
y
Ff mN
fk
N
m
V constant
mg
mgy
x
mgx
a