Considering the equilibrium of the forces acting at D, we have

Again, considering the equilibrium of the forces acting on B. The point B is in equilibrium under the action of the following forces, as shown in Fig. 6.3 (b).

**(i)**** **The weight of ball (w = m.g),

**(ii)**** **The centrifugal force (FC),

**(iii)**** **The tension in the arm (T1), and

**(iv)**** **The tension in the link (T2).

Resolving the forces vertically,

**Notes : 1. **When the length of arms are equal to the length of links and the points P and D lie on the samevertical line, then

Therefore the above equation becomes

**2. **When the loaded sleeve moves up and down the spindle, the frictional force acts on it in a directionopposite to that of the motion of sleeve.

If F = Frictional force acting on the sleeve in newtons, then the above equations get reduced as

The + sign is used when the sleeve moves upwards or the governor speed increases and negative sign is used when the sleeve moves downwards or the governor speed decreases.

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