Explain the concept of under steering and over steering with sketches.
During turns, centrifugal force acts on the wheels. Two cases can arise:
i) Oversteering:
When the slip angles of the front wheels are less than those of the rear wheels, radius of the turn is decreased. This means that the vehicle will turn more sharply than it should for a given rotation of the steering wheel. This condition is called oversteering.
ii) Understeering:
When the slip angles of the front wheels are greater than those for the rear wheels, radius of the turn is increased. This means that the vehicle will turn less sharply than it should for a given rotation of the steering wheel. This condition is called understeering.