According to my physics textbook,

$1)$ When analysing the statics of a particle of mass $m$ from a reference frame which is rotating with angular speed $\omega$, we need to add a pseudo force known as centrifugal force, apart from other real forces acting on the particle.

$2)$ If the particle has a velocity when observed from a rotating frame, in general, there will be two pseudo forces acting on it———— Centrifugal force and Coriolis force

While I understand these two points, what I want to know is, if we draw a free-body-diagram of an object from a rotating frame, and the object has a velocity relative to the rotating frame, don’t we include the real forces acting on the object along with the two fictitious forces?


Yes, of course we include the real forces. Real forces would be included in both inertial as well as non-inertial frames. But in non-inertial frames we have to additionally include pseudo forces, such as those you mention.

  • $\begingroup$ Thank you. While I knew it would be very strange if we did not include the real forces, I wanted to be 100% sure $\endgroup$ – π times e May 17 at 15:15

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