Solving a Physics Question: Wheel Mass 15kg, Radius 1m, Step 0.4m

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To solve the physics question regarding a 15kg wheel with a radius of 1m being pulled over a 0.4m step, the initial force required to turn the wheel can be determined by analyzing the torque and the forces acting on the wheel. The height of the step creates a pivot point, and the force must overcome the gravitational torque to lift the wheel. As the wheel rises, the horizontal force needed will change due to the shifting center of mass and the angle of the wheel relative to the step. The calculations involve using the weight of the wheel and the geometry of the situation, including the triangle formed by the radius and height of the step. Understanding these principles will clarify the relationship between the force and the wheel's motion over the step.
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I have no idea how to attempt this question, please help me. Anyone.

The question : The diagram shows a wheel whose mass is 15kg and radius 1m being pulled by a horizontal force F against a step 0.4m high. What inital force is just sufficient to turn the wheel so that it will rise over the step? What happens to the size of this horizontal force as the wheel rises?

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This question is the last part of a long question, I did all the other parts. Can someone just break this down?
 
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Does this get you started, did I make any mistakes?
 

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Omg I knew IT! I should of made a triangle my father was trying to help me but he didn't listen!
 
I thank you so much, the .8m will be multiplied by the 150N
 

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