find the work done in moving an object along a vector r = 3i + 2j - 5k if applied force is F = 2i - j -k

Question

anonymous · Answer

work = F times dr

kainui · Answer

Work=Force*displacement, so we can take each individual direction of force and displacement and multiply them together. Now this is where it gets a little tricky, because work isn't a vector. Work has the units of Joules, which is energy. So what you must do is take the absolute value of all the work done since doing work in the -j direction takes the same amount of energy as pushing something in the +j direction. So now you can sum them all up and get one value, your work!

anonymous · Answer

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anonymous · Answer

take the dot product of force and displacement !! as shown by kr !!