Need for suspension in our car

Why do we have suspension on our car?? Well if the roads were perfect we wouldn't need any form of suspension. Unfortunately..... roads are far from perfect. To keep the shocks and bumps away from the passengers engineers have developed all kind of mechanism's to keep the shocks and bumps away. Basically all mechanism's use something which can deform to provide a flexible medium between the road and the car itself. This flexible medium can be all kind of things i.e. Torsion bars Coil springs Rubber Hydro pneumatic elements Even the wheel itself can be used as a kind of suspension....(In go-karts for example) but more often than not, just the wheel is not enough. When a wheel hits a bump it compresses the suspension (i.e. energy is stored in the suspension) after the bump the stored energy wants to flow back....As a result when you hit a bump without shock absorbers the suspension would continue to go up and down. The shock absorber absorbs the energy generated by hitting the bump and prevents the suspension to continue its up and down movement. Well that is the basic part of the suspension.....not to difficult hey??..... now to let a wheel move up and down is another thing....What functions does the suspension perform? It has to carry the car and its weight......big deal!! It has to keep the wheels perpendicular to the road for maximum grip It has to take the forces for accelerating or braking the car It has to take the torque created from the driveline It has to take the forces involved when cornering the car