1. The problem statement, all variables and given/known data There is 14 kg of mass kept on a chassis (consider chassis weightless). Chassis is having 2 identical rear wheels and 2 Steel caster ball wheels at front. Consider the weight distribution to be equal on each of the wheel. All wheels are coupled to a DC motor-gearbox (1:1) each.The Rear Wheels are having 80mm diameter and made up of rubber and the chassis car is to be moved on a dry vinyl flooring. Adhesion coefficient,μ = 0.85. Find the motor torque required if the car is to be moved at 1.2 m/s. 2. Relevant equations Torque, τ = F * D/2 F : traction force required D: diameter of wheel Traction force, F= β * W W : weight β : adhesion factor 3. The attempt at a solution F = 0.85 * 14*9.81 = 116.74 N and thus τ = 116.74 * 0.080/2 = 4.67 N.mm Are these formulations and method correct? Where and how does the velocity comes into picture?