· It is often necessary to solve problems using both sums of moments and forces. Indeed, both of these sums must be equal to zero for the body to be static.
· An example of a problem that has both forces and moments is given below, ([Hibbeler, 1992], prob 5-4, pg. )
· Consider the pictures of both the hoists below, they are much like the examples that follow. The red dampers apply a force that is almost static to slow the lowering of the upper arms.
· Lets consider another complex system to solve. In this case free body diagrams are beginning to become essential. ([Hibbeler, 1992], prob 5-44, pg. )
· Now, lets try a problem using vectors, ([Hibbeler, 1992], prob 5-83, pg. )