Questions on work done and Newton's third law

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SUMMARY

This discussion centers on the application of Newton's Third Law in the context of work done when driving a nail into different materials. It establishes that the force exerted by a hammer on a nail is greater than the reaction force from the wooden wall, allowing the nail to penetrate. In contrast, the concrete wall exerts a reaction force that exceeds the hammer's force, preventing penetration. The conversation also references a related thread for further exploration of the hammer and nail interaction.

PREREQUISITES
  • Understanding of Newton's Third Law of Motion
  • Basic knowledge of force diagrams (Free Body Diagrams)
  • Familiarity with material properties of wood and concrete
  • Concept of work done in physics
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  • Study Free Body Diagrams in detail to visualize forces in different scenarios
  • Research the mechanical properties of wood versus concrete
  • Explore practical applications of Newton's Third Law in engineering
  • Examine the concept of work done in various physical contexts
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Students of physics, educators teaching mechanics, and professionals in engineering fields who require a deeper understanding of force interactions and material behavior.

Misr
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Hello

1- work done to push body forward is greater than to pull body backward
what is the explanation for this?can you draw the two FBD in both cases ?



2- why is nail driven in wooden wall but not in the concrete wall ؟ I guess this is somehow related to Newton's third law

Thanks
 
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This seems like homework, you should provide some reasoning before we can help.
 
No that's not a homework ..I thought of these questions by myself.

as for the second question I'll tell you what I can imagine about this so far>>
the hammer applies a force on the nail by pulling on it
the nail has an equal reaction in the opposite direction
the nail applies force on the wall
the wall has an equal reaction in the opposite direction
the force of the hammer on the nail is greater than the reaction of the wooden wall so the nail is driven in wood but that's not the case in concrete>>
is my explanation true?if so why the reaction of the wall is different in wood and concrete?
I hope it's a good evidence that my questions are not for homework
 

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