IIT JEE , AIEEE Forum - Physics , Mechanics - What is centrifugal force and centripetal force,when do they apply,plzz explain in detail

budku007

What is centrifugal force and centripetal force,when do they apply,plzz explain in detail

bhartibhanushali

when ever there is circular motion these force are acting

ramyani

1. Centripetal force is a force requirement, not a particular kind of force. Any force (gravitational, electromagnetic, etc.) can act as a centripetal force.

From Newton's second law of motion F = ma, a physical force F must be applied to a mass m to produce this acceleration. The amount of force needed to move at speed v on a circle of radius r is:

$\mathbf{F}_c = -\frac{m v^2}{r} \hat{\mathbf{r}} = -\frac{m v^2}{r} \frac{\mathbf{r}}{r} = -m \omega^2 \mathbf{r} = -m \boldsymbol\omega \times (\boldsymbol\omega \times \boldsymbol r )$

2. The centrifugal force is a fictitious force that arises from being in a rotating reference frame. To eliminate all such fictitious forces, one needs to be in a non-accelerating reference frame, i.e., in an inertial reference frame. Only then can one safely use Newton's laws of motion, such as F = ma.

budku007

means in non inertial frame centrifugal force does not act right??

deedee

i guess we consider it

bt as pseudo force in non inertial frames

hardcore_genius

Actually centripetal forces are the forces that are necessary for any body to rotate about any axis.For example, when a stone is rotated by a string, the tension provides centripetal force, if the string breaks, tension becomes zero& so rotation stops.
Centrifugal force is nothing, it is a pseudo force, which actsupon a rotating body , if observed through a non inertial frame.
CHEERS !!

Ask & Discuss Questions with Community & Experts