i have to design a vehicle that will accelerate up a 1/8 gradient hill to 11.11m/s in 15s(adsbygoogle = window.adsbygoogle || []).push({});

i need the effort required and wheel torque.

mass = 170kg

rolling resistance = 50N/t (0.05N/kg)

air resistance = 13.6N

g = 9.81m/s^2

i have calculated:

a = 11.11*(1/15) = 0.74m/s^2

theta = 7.18 deg

sin theta = 0.125 deg

so i have the effort as:

E = ma+mgsin_theta+Froll+Fair

E = 125.8+(170*9.81*0.125)+0.05+13.6

E = 347.9125N

is E the torque i need at the wheels?

if not how would you go about working it out.

i tried with a motor of 40N, wheel radius of 0.2m and gear ratio of 10:1

i worked it out like this.

axle torque = 40*10 = 400N

so to find the torque at the wheel do i divide the axle torque by wheel radius

400/0.2 = 2000 that seems wrong to me??

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Question on effort

**Physics Forums | Science Articles, Homework Help, Discussion**