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Question

Gradient resistance for a vehicle depends on which of the following factors

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A.

Weight of the vehicle

B.

Size of the vehicle

C.

 Width of tyres

D.

Speed of the vehicle

Answer ( Option A)

Weight of the vehicle

Solution

Broadly the resistances can be categorized into the following categories:

  • Aerodynamic drag
  • Gradient resistance
  • Rolling resistance 
  • Inertia

Air resistance/ Aerodynamic drag: When a body travels within a dense medium, the molecules of the medium collide with the moving object and thereby absorb some of the energy. This is felt as a resistance to the moving object. If the medium is denser, then the resistance is more

Gradient resistance: When the vehicle travels uphill, a component of its weight works in a direction opposite to its motion. If some energy is not supplied to overcome this backward force, then the vehicle would slow down, stall and roll backwards.

Rolling resistance : When a vehicle rolls, it rolls with its tires in contact with the road surface. The relative motion of two hard surfaces produces a friction

Rolling resistance is composed of the following components:

  • Tire Rolling resistance: FR,T
  • Road rolling resistance: FR,Tr
  • Resistance due to tire slip angle: FR,α
  • Resistance due to bearing friction and residual braking: FR,fr


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