Automobile Engineering in ME
The rigid suspension is beneficial when

It is desired to reduce the unsprung mass
It is desired to improve tyre to ground contact characteristics
Large changes in load make it necessary to have a large suspension stroke
It is desired to have more flexibility in design

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Automobile Engineering in ME
The ball joints are used on the tie rod ends, because they

Reduce the amount of noise generated
Reduce the amount of sliding resistance
Improve the force transmission speed
Can deal with movement of the suspension both vertically and in other directions

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