Question

A force AB of length 100m and weight 600N has its centre of gravity 4.0 m from the end, and lies on horizontal ground calculate the force required to begin to lift the end

Answer 1

F = 24 N

Step-by-step explanation:

In this exercise we have a bar l = 100 m with a center of gravity x = 4 m, which force is needed to lift it from the other end

Let's use the rotational equilibrium relationship, where we consider the counterclockwise rotations as positive and fix the reference system at the point closest to the center of gravity

∑ τ = 0

F l -x W = 0

F =
`(x)/(l) \ W`

let's calculate

F =
`(4)/(100)`4/100 600

F = 24 N