Pick the right statement about normal force: (section 5.7)
a. normal force is always perpendicular to the area of contact between an object and support
b. normal force is always antiparallel and equal in magnitude to force of gravity (weight).
c. normal force is always equal in magnitude to force of gravity (weight).
d. normal force is always antiparallel to force of gravity (weight), meanwhile its magnitude can be any.

A. Normal force is always perpendicular to the area of contact between an object and support.

Explanation:

Normal force is defined as the contact force. If there is no contact between the surfaces, they cannot applies a force which is normal on each other. For e.g, the surfaces of a cubical box and the cart cannot applies a force of normal on each other because of no contact.

If, when there is a contact between two surfaces they applies a normal force on each other, and this force is  perpendicular to the each other . This normal force is necessary to prevent object to penetrating into other.

he . if i may ask what i your question exactly?

explanation:

first thing first of the answer is with technology. second thing second thing is that the big bang theory did not happened u see they say it did but what they dont realize is that like dinasures are still a round they might deny it but they and look at these 12 foot human skelteons they find lets see didnt the bible say something about giants. hope this peace.