# Is tangential force the same as centripetal force?

## Homework Statement

Rotor blades attatched to a disc rotate.
The rotor blades rotate at a speed of 15574rpm. The blades are 220mm from the centre of the disc.

These blades are attatched to a disc that is 400mm in diameter.

Not too sure if centripetal force is the same as tangential force though?

## Homework Equations

(itex)f=mv^2/r(/itex)

## The Attempt at a Solution

First calculated the centrifugal acceleration

(itex)=Mω^2r(/itex)
Centrifugal acceleration = 53197m/s

Then find the centrifugal force

(itex)f=mv^2/r(/itex)

I have the velocity and can obtain the mass and radius.

I need to find angular acceleration?

Thanks for the in advance help guys.

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rcgldr
Homework Helper
A centripetal force is a force perpendicular to the instantaneous velocity of a point on the rotors. A tangental force is a force in the directioni (or exactly opposite of the direction) of a point on the rotors.

What does the ".../rad" mean in this problem statement?

So to calculate the tangential force I would need to angular velocity and then use the formula:

$Pr=I_oa$

rcgldr
Homework Helper
What does the ".../rad" mean in this problem statement?
So the force is a function of radians and is increasing as the rotors rotate, so at 0 radians, the force is 0, at 1 radian, the force is 8kN, at 2 radians, the force is 16kN, ... . Are you sure this is what the problem intended?

So the force is a function of radians and is increasing as the rotors rotate, so at 0 radians, the force is 0, at 1 radian, the force is 8kN, at 2 radians, the force is 16kN, ... . Are you sure this is what the problem intended?
The problem is to find the force acting on the circumference of the disc.
There are blades that attach to this disc which make up a rotor blade.
The forces shown (in the .jpg ) are those acting upon the blades.

rcgldr
Homework Helper
What does the ".../rad" mean in this problem statement?
The problem is to find the force acting on the circumference of the disc. There are blades that attach to this disc which make up a rotor blade.
The forces shown (in the .jpg ) are those acting upon the blades.
The ".../rad" doesn't make sense. I think that the problem statement and the diagram should not have that ".../rad" component, in which case, at 220mm from the center of the disc, you have 8kN of centripetal force and 600N of tangential force. I'm not sure what the term "tangential blade loading" means. I did a web search for "blade loading" and I see math involving "tangential mean swirl velocity".

haruspex