Which describes a positive or negative net force acting on an object? check all that apply.
it can cause an object to accelerate.
it can cause an object to stop moving.
it can cause an object to start moving.
it can cause an object to change directions.
it can cause an object at rest to remain at rest.

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.