friction

Question 1

what is fluid friction?

Answer 1

complete separation of surfaces by a lubrication resulting in little to no friction

Question 2

formula for single clutch frictional torque

Answer 2

2× UW× (r1+r2)
÷
2

2 (no of faces)
u (coefficient of friction)
w (spring force)
r2 and r2 are radius

Question 3

formula for dual clutch frictional torque

Answer 3

4×UW×(r1+r2)
÷
2

4( no of faces)
u (coefficient of friction)
w (spring force)
r2 and r2 are radius

Question 4

what is the formula for frictional torque?

Answer 4

Force × Radius × coefficient of friction (u)= Nm Newton Meters

Question 5

if a vehicle weight 13100.2N and requires a horizontal force of 4112N then how would the formula for coefficient of friction look?

Answer 5

U ( coefficient of friction)= horizontal force/ weight

U=4112 / 13100.2

Question 6

formula for coefficient of friction?

Answer 6

U( coeffienxt of friction) = horizontal force / downwards force
= no units

Question 7

what is sliding friction?

Answer 7

this is also known as kinetic friction and is friction that occurs after or during movement. It is less than static friction

Question 8

what is static friction?

Answer 8

this is friction that occurs at rest

Question 9

what are the 4 laws of friction

Answer 9

independent to speed
dependant of surface finish (smoothness)
directly proportional to force acting on it.
independent of surfaces acted upon

Question 10

what is the formula for frictional force of a clutch?

Answer 10

coeffient of friction (U) × spring force (W)

Question 11

what is the formula for work lost in multiple rotations by friction?

Answer 11

2pieNTU

N= Number of rotations
T= Torque
U= coeffient of friction

Question 12

what is friction?

Answer 12

force that opposes sliding movement between surfaces

Question 13

what is dry friction?

Answer 13

friction that occurs between surfaces with no lubrication.

eg Brakes, Clutch, Tires

Question 14

what is the formula for power lost during friction?

Answer 14

2PieNTU / 60 = Watts

n= number of rotations
T= torque
U= coeffient of friction
Watts= W

Question 15

what is the formula for work lost due to friction?

Answer 15

2pieTU= J

T= Torque
U= coeffient of frixtion
J= Joules

Question 16

Formula for power of a clutch?

Answer 16

2pieNTU / 1000 = W

N= number of rotations
T= Torque
U= Coeffient of friction
W= Watts

Question 17

What is boundary friction

Answer 17

partial separation of surfaces by a lubrication