Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版:英文原文完整保留,中文紧随对应单元;术语采用 v20260916 确认表,自动语义审校结果可追溯。

Time Dependent Acceleration

时间依赖的加速度

If a time dependent acceleration can be expressed as a polynomial in time, then the velocity and position can be obtained, provided the appropriate initial conditions are known. Allowing the acceleration to have terms up to the second power of time leads to the following motion equations for one dimensional motion.

Variable acceleration
变加速运动
Polynomial integrals
多项式积分
Polynomial derivatives
多项式导数
Calculation
计算
Example problem
例题
如果加速度可以表示为时间的多项式形式,则可以在已知适当初始条件的情况下求得速度和位置。允许加速度包含时间的二次项,从而得到一维运动的以下运动方程。
Index

Motion concepts

Velocity and acceleration
索引 运动概念 速度与加速度
 
HyperPhysics***** Mechanics
力学
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Motion Calculation, Variable Acceleration

变速运动的计算

For a variable acceleration which can be expressed as a polynomial in time, the position and velocity can be calculated provided their initial values are known. .

m seconds
秒
中文译文中的待填/计算数值依次对应:1:t。实际数值以上方原输入框为准。
m/s
m
m/s
m/s2

Note that even in this one-dimensional case for non-constant acceleration, the average velocity is not equal to the average of the initial and final velocities. The average velocity must be calculated from:
m/s
m/s

The average velocity expression from the constant acceleration equations works only for constant acceleration where the graph of velocity as a function of time is a straight line, the average being the midpoint of that line over the chosen time interval. If you make c and d in the above expressions equal to zero, dropping back to constant acceleration motion, then the two expressions for average acceleration will give the same answer.
对于可以表示为时间多项式的变量加速度,只要已知初始值,就可以计算出位置和速度。需要注意的是,即使在一维情况下,非恒定加速度的平均速度也不等于初始速度和最终速度的平均值。平均速度必须从以下表达式计算:从恒定加速度方程中得到的平均速度表达式仅适用于恒定加速度的情况,其中速度作为时间函数的图像是一条直线,平均值是该直线在选定时间区间内的中点。如果在上述表达式中将c和d设为零,回到恒定加速度运动,那么两个平均加速度的表达式将给出相同的结果。
中文译文中的待填/计算数值依次对应:1:b 2:c 3:d 4:x0 5:v0 6:x 7:v 8:a 9:va 10:van。实际数值以上方原输入框为准。
Index

Motion concepts

Velocity and acceleration
索引 运动概念 速度与加速度
 
HyperPhysics***** Mechanics
力学
R Nave
Go Back
返回