Answer:
(a)the moment about point A is zero
(b) the box does not tip
Explanation:
Consider the diagram of forces as shown in the diagram given in the attached document.
Given the pulling force F= 20 lb and the weight W= 25 lb. and given the height and length of the box to be 5ft and 8ft respectively. We take moment about A.
Moment is the product of force and the perpendicular distance from the line of action of a force.
It is clear that F act through the distance 5ft and W acts through 4ft.
Hence total clockwise moment =total anticlockwise moment
20 × 5 = 25 × 4
Or
Sum of all moment is zero
100-100 =0
The moment due to both forces are equal, hence there is equilibrium. Since there is
equilibrium the box does not tip.
