A farmer wishes to remove several fence posts. Each post is buried 18 in. in the

Question

A farmer wishes to remove several fence posts. Each post is buried 18 in. in the ground and will require a maximum vertical pulling force of 175lbs to remove it. He can use his truck to develop the force, but he needs to devise a method for their removal without breaking the posts. Design a method that can be used, considering that the only materials available are strong rope and several pieces of wood having various sizes and lengths. Submit a sketch of your design and discuss the safety and reliability of its use. Also, provide a force analysis to show how it works and why it will cause minimal damage to a post when it is removed.

Explanation / Answer

http://i.imgur.com/gQran.png is a force analysis of you system. However, add an intermediate level so that the forc eon the truck is purely horizontal or the vertical component on it is downwards so that the tyres have better grip from Normal reaction.

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