a block is on a surface with us=0.325 it takes 4.11 N to break it free from static friction how much normal force acts on a block? Pls do help I will put this as the brainiest

The answer is trial 3.

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other

Answerthe global climate during the paleogene departed from the hot and humid conditions of the late mesozoic era and began a cooling and drying trend which dispite having been periodically disrupted by warm periods such as the paleocene-eocene thermal maximum, persists today;

Mass of bob (g)will be the answer