Traditional Culture Encyclopedia - Photography and portraiture - The difference between the modulus ratio dt and the dr ratio dt of the dr vector.

The difference between the modulus ratio dt and the dr ratio dt of the dr vector.

One is the order of magnitude, and the other is the proportional value. The modulus ratio dt of dr vector is an order of magnitude, indicating the distance that an object moves in a period of time, and the unit is usually meters per second, while the dr ratio dt is a proportional value, indicating the proportional relationship between the direction and distance of the object moving in space in unit time, that is, the speed of the object. In physics, the modulus ratio dt and dr ratio dt of dr vector are both difference components in physical quantities. The concepts of dr and dt are widely used in Newton's laws of motion, vector method, calculus and other physical and mathematical fields.