What is a vector and a scalar, what is a vector and what is a scalar

A vector is a quantity that has both magnitude and direction, also known as a vector. Some physical quantities only have numerical magnitude and no direction, and some of them have positive and negative points.

1. Scalar quantities are also known as "vectorless quantities". Some physical quantities only have numerical magnitude and no direction, and some of them have positive and negative points. Operations between these quantities follow general algebraic laws. In layman's terms, a scalar quantity is a quantity that has only a magnitude and no direction.

2. A vector is a quantity that has both magnitude and direction, also known as a vector. Generally speaking, they are called vector quantities in physics, such as velocity, acceleration, force, and so on. Abandon the practical meaning, and abstract it into a mathematical concept vector.

In computers, vector graphics can be infinitely enlarged and never deformed.

3. The vector expression of physical laws has nothing to do with the choice of coordinates, and vector symbols provide a simple and clear form for the expression of physical laws, and simplify the derivation of these laws, so vectors are useful tools for learning physics.

Difference Between Vector and Scalar.

1).Vectors have magnitude and direction, while scalars only have magnitude and no direction

2).Vector operations conform to the parallelogram rule. Scalar operations directly add and subtract

The difference between vectors and scalars is that vectors have directions while scalars have no directions, so is there any direction.

The physical quantities with directions are not necessarily vectors, such as current intensity, electromotive force, moment, etc., all have directions, but they are not vectors. Physical quantities such as force, velocity, displacement, acceleration, etc., not only have directions, but also follow the parallelogram law when synthesized and decomposed, then these quantities are vector quantities. And although the current intensity, electromotive force, moment, etc., have directions, they do not have to follow the parallelogram rule in the process of operation, as long as they do algebra and operation, so they are not vectors.

The correct statement should be that a physical quantity that has a direction and follows the parallelogram rule is called a vector.

The difference between vector and scalar is that a vector is a physical quantity that has both direction and size, whereas a scalar quantity is a physical quantity that has only a magnitude and no direction.

One is that after selecting a unit of measurement, only the size of the quantity needs to be expressed numerically is called a scalar quantity. The other is that after selecting a unit of measurement, in addition to using numbers to indicate its size, it is also necessary to use a certain direction to explain the property, which is called a vector.

In middle school physics, both vectors and scalars have the problem of plus and minus signs. Vector plus or minus signs indicate the direction of the vector, if the vector is positive, it means that the vector is the same as the selected positive direction. A negative vector means that it is the opposite of the selected positive direction, and the scalar plus or minus signs.

Although scalars have no direction, some scalars also have positive and negative signs.

Introduction to both

Vectors, also known as vectors. Some physical quantities are completely determined by the magnitude and direction of the values, and the operation between these quantities does not follow the general algebraic laws. They follow the rules of geometric operations when adding and subtracting, and such quantities are called physical vectors.

Such as velocity, displacement, force, impulse, momentum, electric field strength, magnetic field strength, etc.

Scalars, also known as vectorless quantities. Some physical quantities have only numerical magnitude and no direction, and the operation between these quantities follows the general algebraic law, and such quantities are called scalar quantities. Such as mass, density, temperature, work, energy, distance, rate, volume, time, heat, resistance and other physical quantities.

The difference between vector and scalar 1. The difference between concepts One is that after the unit of measurement is selected, the quantity that only needs to be expressed by numbers is called scalar; The other is that after selecting a unit of measurement, in addition to using numbers to indicate its size, it is also necessary to use a certain direction to explain the property, which is called a vector. 2. Differences in Algorithms In middle school physics, length, mass, time, density, work, energy, temperature, current intensity, etc. are all scalar quantities, and scalar operations obey algebraic algorithms. Force, displacement, velocity, acceleration, momentum, impulse, electric field strength, magnetic induction strength, etc., are all vector quantities, and the operation of vectors should follow the law of parallelograms or triangles.

Vectors are often represented by straight line segments with arrows. The length of the line segment represents the size of the vector, and the arrows represent the direction of the vector. 3. The difference between positive and negative signs In middle school physics, whether it is a vector or a scalar quantity, there is a problem of positive and negative signs.

However, there is a fundamental difference between vector plus and minus and scalar plus and minus. Vector plus or minus signs: On the premise of selecting a positive direction, the plus and minus signs of the vector essentially indicate the direction of the vector.

If the vector is positive, it means that the vector is in the same direction as the selected positive; A negative vector indicates that it is the opposite of the selected positive direction. Scalar plus and minus signs: Although scalar quantities have no direction, some scalar quantities also have positive and negative signs.