The force applied horizontally must cause a torque that will be equal to that caused by the wheel, first we must find the horizontal distance from the step to the center of the wheel (where the force of gravity is drawn)
By assembling a triangle we can find this value
0.34-0.12=0.22
from pythagorean theorem
L2=0.342-0.222=0.0672
L=0.26 m
Then we match the torques so that torque from gravity= torque from applied force
The horizontal distance from the applied force will be 0.34-0.12=0.22m
L1Fg=L2Fapplied
0.26m(25N)=0.22(F)
solve for F and you see that
F=
