Automobile Engineering in ME
The main feature of Macpherson strut suspension is that

The unsprung mass in lighter
Non vertical external forces are supported by the suspension arms
The vertical size of the suspension can be made more compact
The assembly is slightly more complicated 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 sliding resistance
Improve the force transmission speed
Reduce the amount of noise generated
Can deal with movement of the suspension both vertically and in other directions

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