I'm thinking that's not enough for satisfactory performance. See your other thread for a similar discussion from a torque and force viewpoint; however, you can look at this in terms of power as well.I'm thinking of building a 2,000 lbs mini car with a motor for each wheel. In reading various threads around here, I'm getting the impressing I could use four 5kw motors with appropriate gearing to power this thing. Am I on the right track?
I'm thinking that's not enough for satisfactory performance. See
- to accelerate to 60 mph would require 327 kJ (energy = 1/2*mass*velocity squared),
- and 20 kW for about 16 seconds would deliver 327 kJ,
- so it would take 16 seconds to get from zero to 60.
The time to deliver the required kinetic energy provides a first approximation of the minimum value of the acceleration time. I don't think that QuodMagusZerum was looking for a more sophisticated model, and this first approximation served the intended purpose.No, E=0.5MV^2 gives you the kinetic energy, not the energy required to accelerate. The sum energy to accelerate involves integrating the equations for aerodynamic drag, mechanical drag, fed into Force = Mass x Acceleration, where Force is net of the drag components.
In fact it would take much longer, since much more energy would be required to overcome drag.