Difference between Centripetal and Centrifugal Force Video Lecture - Class 9

imagine swinging a rope around in a
circle with a can attached to the end
the can is in a constant state of
acceleration since its velocity is
constantly changing due to its circular
path acceleration of the can is caused
by a net force acting on the object in
the case of an object moving in a
circular path the net force is called
centripetal force or center seeking
force and is always pulling an object
toward the center of a circle without
this force an object will continue
moving in a straight line motion the
centripetal force is the tension on the
rope the centripetal force is equal to
mass times velocity squared divided by
the radius as these variables change so
will the centripetal force an increase
in mass or velocity or a decrease in
radius will result in an increase in the
centripetal force a decrease in mass or
velocity or an increase in radius will
result in a decrease in the centripetal
force a change in velocity results in
the largest change in centripetal force
if the rope is cut the can will no
longer maintain a circular path and it
will fly in a straight line tangent due
to Newton's first law of inertia the
force of gravity pulls the moon towards
the center of the earth this pole is the
centripetal force keeping the moon in
orbit around the Earth
if Earth's gravity ceased to exist the
moon would fly off into space in a
straight line another example of
centripetal force is the force that
binds mud to attire as it rotates as the
rotation speed of the tire increases the
centripetal force will not be great
enough to hold the mud onto the tire and
the mud will fly off the tire in
straight-line tangents as we saw with
the can that was attached to the string
the centripetal force is the force that
creates the tension on the string the
center seeking force there are two
perspectives in this example outside of
the can and
inside the can as Newton's third law
states for every action there is an
equal and opposite reaction from outside
of the can there should be an outward
reaction force to the centripetal force
this Center fleeing force is known as
the centrifugal force the reactive
centrifugal force is the reaction force
to a centripetal force the can
undergoing curved motion constantly
accelerates toward the axis of rotation
this centripetal acceleration is
provided by a centripetal force which is
exerted on the can by some other object
this is the reactive centrifugal force
it is directed away from the center of
rotation and is exerted by the rotating
can on the object that originates the
centripetal acceleration if an object is
placed inside the can the object appears
to have an outward force pushing it
against the bottom of the can and away
from the center of rotation the apparent
centrifugal force is most commonly
introduced as an outward force apparent
in a rotating frame or reference it is
apparent or fictitious in the sense that
it is not part of an interaction but
actually the object's inertia the object
naturally wants to travel in a straight
line but the centripetal force doesn't
allow this this type of force is
associated with describing motion in a
non inertial reference frame and
referred to as a fictitious or inertial
force the reactionary and apparent
centrifugal forces are not real forces
the reactionary centrifugal force is a
result of the rotation not a force the
apparent centrifugal force is really the
object's inertia a more accurate
definition for centrifugal force would
be the lack of centripetal force the
concept of centrifugal force is used to
describe the physics of rotating devices
such as a centrifuge centrifugal pump
centrifugal governor's and more even
though centrifugal force is not a real
force it's commonly used because it's
easier to describe
the fictional force then describing the
lack of the real centripetal force pumps
that have an inlet we have the center of
rotation and an impeller that forces
water outward against a volute to
channel the water to an output away from
the center of rotation are known as
centrifugal pumps because the water is
Center FLE the centripetal force is not
strong enough to keep the water
traveling in a circle with the impeller
resulting in the water moving out
towards the pump the loop the physics of
a centrifugal pump are not based on the
imaginary centrifugal force but the lack
of centripetal force