Question

If the traction resistance is equal to the total running resistance, then which of the following will happen?

(a) The vehicle will accelerate

(b) The vehicle will decelerate

(c) The vehicle will run at a constant velocity

(d) The vehicle will come to rest

This question was posed to me in an interview for internship.

I need to ask this question from Vehicles and Powertrain in portion Emission Control Methods, Electric & Conventional Vehicles of Automobile Engineering

Answer 1

The correct option is (c) The vehicle will run at a constant velocity

Explanation: Ftraction = Frunning (given).  Frunning = Frolling + Faerodynamic and Fnet = Ftraction – (Frolling + Faerodynamic). Fnet = Ftraction – Frunning = 0 N = mvehicle * avehicle ⇒ avehicle = 0 ⇒ Vvehicle = constant. Therefore the vehicle will run at a constant velocity.