Friction is the type of force which tends to
oppose relative motion between two surface in contact.
OR
Friction
is the force which resists a body from motion.
Friction force which occurs in fluids is known
as viscosity
How Friction Happens
The friction force occurs due to the following
i)
Adhesive
bond
ii)
Mechanical
bond
iii)
Deformation
Adhesive
Bond
The attraction
force between two bodies can raise friction where particle from that object
tend to bind each other so it is difficult to break that bond.
Mechanical
Bond
Mechanical bond
it raised due to peaks and valleys that tend to bind each other so it is
difficult to break that bond. When a body becomes rough means it possesses long
peaks and dip valleys.
Deformation
Sometimes
deformation causes the friction, when the body deform create valley and the one
which inter in that valley is peak.
Advantage of Friction
i)
It aids in walking
and movement
ii)
Help moving body to
stop
iii)
Used to wear
unneeded layers of some material
iv)
Cause lighting match
stick
v)
Cause nail to stick
on the wood
vi)
Help bottle stopper
to stick on the bottle neck
Disadvantage of Friction
i)
cause wear and tear
ii)
loss of heat energy
iii)
slow down motion of
the body
iv)
heat can cause
appliance to burn
v)
it causes wounding,
when skin wearing
Methods of Increasing Friction
i)
Increase normal
force by increase the weight of the body
ii)
Changing/increase
roughness of the surface
iii)
Use material of high
coefficient. Example, rubber band
Methods of Reducing Friction
i)
Place roller between
the two rough surfaces
ii)
Use ball bearing
iii)
Use lubrication e.g.
oil, water
iv)
Speedy material
which have low coefficient of friction and thus slide easily.
v)
Make surface soft
No comments:
Post a Comment