A circular coin of radius R and mass M is placed so that it touches a step of length R as shown in figure. The minimum value of the horizontal force F required to pull the coin over the step Is?

When the force is applied normal to the circumference at point P, then it's zero.
It should be noted that force simply means an influence that can change the position of an object.
In this case, when the force is applied normal to the circumference at point P, then it's zero.
Also, if the force is applied normal to the circumference at point X, then it's constant.
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