Consider a man pulling a nail from a wooden wall using a crowbar. The crowbar contacts the wall at point A. The man applies a vertical force F1 on the grip of the crowbar, whereas it takes a force F2 at the claw to pull out the nail. Determine the minimum force the man requires to pull out the nail. At point A, the moment due to force F1 can be expressed as the sum of the product of the magnitude of the force and the perpendicular distances. By substituting the values, the moment at A due to F1 can be determined. Similarly, resolving the force F2 at the claw into its components, the moment due to F2 at point A can be determined using the sine component of F2. Since the moment of force, F1 is smaller than F2, force F1 is insufficient to remove the nail. By comparing both the moment of force equations and substituting the value, the minimum force required to pull out the nail can be determined.