Does anyone know how to resolve forces in 3 directions?

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SUMMARY

The discussion focuses on resolving forces in three dimensions, specifically using the vector displacement represented as i + 2j - k. Participants emphasize the importance of understanding the dot product, which calculates the component of a vector in a specific direction by multiplying the vector with a unit vector. The concept of tensors is also mentioned as a relevant tool for further understanding vector resolution in three-dimensional space.

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  • Vector mathematics, specifically understanding vector components
  • Dot product calculation and its geometric interpretation
  • Tensors and their application in physics
  • Basic knowledge of three-dimensional coordinate systems
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  • Study the properties and applications of tensors in physics
  • Learn how to calculate the dot product of vectors in three dimensions
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Homework Statement
3 dimensional vectors
Relevant Equations
I have been given a question as follows :
A force 𝐹=2𝑖 +3𝑗 +𝑘 N moves a particle from 𝑟1=𝑖+2𝑗 m to 𝑟2=2𝑖 +4𝑗−𝑘 m.
Find the component of 𝐹 in the direction of the displacement. Give your answer to 3.s.f
I know the direction of the displacement is: i+2j-k, but I do not know how to resolve in 3 dimensions. If anyone knows how to do this could they please help me. Thank you.
 
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Please look up 'tensor' and maybe show a little more work.
 
sysprog said:
Please look up 'tensor' and maybe show a little more work.
thanks
 
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The component of a vector in a particular direction is the dot product of the vector with the unit vector in that direction. You should be able to rationalise this with a geometrical argument (how is the dot product defined?).
 
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