Variable speed movement

[biàn sù yùn dòng]

Physical terms

This entry is made by Compilation and application of scientific encyclopedia entries of "Science Popularization China" to examine.

——Speed (vector, with size and direction) changing (or size, or direction) (that is, a ≠ 0) is called variable speed motion;

——Motion with constant speed (i.e. a=0) and direction is called Uniform motion ；

The variable speed movement is divided into Uniform speed movement (acceleration unchanged) and Variable acceleration motion (Acceleration change).

Therefore, the variable acceleration movement is not for the variable deceleration movement, but for the uniform speed movement.

Uniform speed movement

acceleration Movement that does not change (the required size and direction do not change)

Constant speed change movement may be Rectilinear motion （ uniforn variable rectinear motion ）, or it may be Curvilinear motion (e.g Horizontal throwing motion ）

Chinese name: Variable speed movement
Field: Physics

Concept: Movement speed changes
Nature: noun

catalog

uniforn variable rectinear motion

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concept

1. The definition of uniform linear motion: motion along a straight line with constant acceleration is called uniform linear motion. When the acceleration and velocity are in the same direction, the object constant acceleration When the acceleration and speed are opposite, the object Straight motion with uniform deceleration 。

2、 uniforn variable rectinear motion Features: The magnitude and direction of acceleration of uniform speed linear motion do not change with time.

3、 uniforn variable rectinear motion It is also an ideal movement process.

4. When the acceleration and speed are in the same direction, it is a linear motion with uniform acceleration.

formula

1 Speed formula: V2=V1+at

two displacement Time formula: x=(v1+v2) * t/2=v1 * t+1/2at ^ 2

3 Displacement speed formula: 2ax=v2 ^ 2-v1 ^ 2

Variable acceleration motion

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"Variable acceleration movement" is relative to "constant speed movement". We convert the acceleration (or Resultant external force ）Constant motion is called "uniform speed change motion", and the motion with variable acceleration (or external force) is called "variable acceleration motion".

Note that acceleration (or combined external force) is a vector, and whether it changes depends on two aspects: size and direction!

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