A scalar is a magnitude only (...I am driving at 60 miles per hour), while a vector is a magnitude and direction (...I am driving at 60 miles per hour, heading east).
William Rowan Hamilton, the Irish Genius.
Scalars are not always negative. The word scalar means that a value behaves like the numbers we are familiar with. You just add and subtract them. These are different than vectors, where you need to break them into scalars in order to add them first.
Vectors that go in different directions are called orthogonal vectors. This means that the vectors are perpendicular to each other, with a 90 degree angle between them.
Two vectors: no. Three vectors: yes.
Two vectors, no; three vectors yes.
Yes.
Yes, two vectors of different magnitudes can be combined to give a zero resultant if they are equal in magnitude but opposite in direction. For three vectors to give a zero resultant, they must form a closed triangle or meet at a common point where the sum of the vectors equals zero.
The three types of vectors are position vectors, displacement vectors, and force vectors. Position vectors represent the position of a point in space relative to a reference point, displacement vectors represent the change in position of an object, and force vectors represent the interaction between objects that can cause acceleration.
Equal vectors are vectors having same direction of action or orientation as well as same magnitude. If two or more vectors have same magnitude but different direction then they cannot be called equal vectors. This shows that direction is important for equal vectors.
The term for vectors that don't lie in a straight line but point in different directions is "non-collinear vectors."
Two vectors having same magnitude but different direction are called equivalent vectors.
Displacement Vectors