You are trying to lift a bicycle wheel of mass and radius up over a curb of height. To do this, you exert a horizontal force.
i) Determine the least magnitude of the force which will succeed in lifting the wheel onto the curb if the force is exerted at the center of the wheel?
ii) Determine the least magnitude of the force which will succeed in lifting the wheel onto the curb if the force is exerted at the top of the wheel?
iii) In which case is less force needed?