Question

i am having trouble understanding Moments of Force. When do you use M = Fd vs M=rxF??

Answer 1

you always use M =rXF

Answer 2

M=Fd is mostly used when we know that force is acting at right angle to the vector d

Answer 3

oh i see but i get confused when finding r, is r always finding i,j and k ???

Answer 4

ya!

Answer 5

most of the times

Answer 6

you see r is a vector and using i, j and k is one way to represent a vector