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Vectors problem

  • Thread starter greg997
  • Start date
  • #1
77
0
Hi,
I ve got two questions.

1. how to find the component of the force F in the direction of the displacement s?

I have two vectors and angle between them.


2. how to find moment of force F when applied at position r= 2a+7b-3c


No idea how to start:(. Thanks for helping me.
 

Answers and Replies

  • #2
LowlyPion
Homework Helper
3,090
4
1) It very much depends on the angle doesn't it? Then which axes you choose to determine he result. I usually choose the axes that make calculation the easiest - like along one of the vectors.

2) Moment is r X F. Your interest then will be in the cross product between the displacement and the force.
 

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