1. The problem statement, all variables and given/known data How much force is required to push a wheel of radius 50 mm and moment of inertia 3.21*10^-4 kgm^2 to 20 mph in 5 seconds? The wheel has a mass of 0.29 kg. The wheel is to be pushed straight and level at its axel 90 degrees to the horizontal. 2. Relevant equations T = Ia = 5.74 Nm F = T/r 3. The attempt at a solution F = T/r = 5.74/0.05 = 114.8 N My answer can't be correct because 114.8 N seems far too much force required to accelerate a 50 mm radius wheel to 20 mph in 5 s. That is less force required to push the 200 kg vehicle it supports, and there are another three wheels!