13 thoughts on “HOMEWORK 7 - Sp 25”

    1. The way I think of it is "What if I were to move all of the forces to this one point. How would I get the same results as in the original situation (as in what forces and moment would I need to get the same results as the initial situation)"

    2. An equivalent force system does indeed have the sum of the moments and the vector of the resulting force on the whole system. In this problem, the disk is in the x-y plane, so the resulting force vector in the system will have i and j components to it. The moment will be expressed as just a vector in the k-direction though since this is a 2D question. So you will need one force vector and one momentum vector to answer this question.

  1. Just to clarify, the resulting moment would act in the negative k_hat direction (since it is clockwise)? Also, as part of our work, do we need to show both the sum of forces in the x-direction and sum of forces in the y-direction? Is it necessary to compute the magnitude of the vector of forces in the x and y directions?

    1. Yeah the resulting moment should be in the negative z-direction. I think you just need to show the resultant force in vector form. I do not think you need to compute the magnitude of the resultant.

    2. It is probably best to leave the magnitude as well just because the problems usually show a magnitude and direction of forces. That is what I did but I'm sure either method works.

      1

Leave a Reply