Python与物理学-计算阻力&；确定对象是否已达到终点速度

我试图计算一个球体的阻力，如果它从建筑物上掉下来，程序会运行，但是方程是错误的。可能是我把这件事搞得太复杂了，但我现在被卡住了。。我想做的是确定球体在分配的时间内经过的距离（这是可行的），但我无法找到一种将阻力作为因素的方法。任何帮助都将不胜感激

import math

height = float(raw_input("Enter the height of the building: ")) #meters
weight = float(raw_input("Enter the weight of the sphere: ")) #weight of sphere in kilograms
mass = float(raw_input("Mass of the sphere: ")) #mass of the sphere
time = float(raw_input("Enter the time interval: ")) #determines how long to continue the experiment after the sphere has been dropped

# kilograms
#variables
velocity = math.sqrt(2) * height * weight #calculate the velocity
energy = 1 / 2 * mass * velocity ** 2 #kinetic energy
gravity = 9.81      #gravity
radius = 0.5       #radius of the sphere being dropped
volume = 4.3 * math.pi * radius ** 3 #calculate the volume
speed = gravity * time #determine the maximum speed in the time allotted
density = mass / volume #determine the density of the sphere
force = mass * gravity  #determine the force in newtons 
drag = gravity * density * speed ** 2 #calculate the drag
distance = .5 * gravity * time ** 2 #calculate the distance traveled

print "Force = {} Newtons".format(force)
print "The ball is", height - distance, "meters from the ground"
print "The maximum speed of the ball was:", speed
print "It would take the ball {} seconds to reach terminal velocity"#.format(None)
print "Density:", density
print "Drag: ", drag
print "Mass: ", mass
print "Volume: ", volume
print "Velocity: ", velocity

---

Python2.7默认为整数除法，因此

energy = 1 / 2 * mass * vellocity ** 2 

相当于

energy = (1 // 2) * mass * velocity ** 2 = 0 * mass * velocity ** 2 = 0

要默认为浮点除法，请在脚本顶部放置以下行：

from __future__ import division

或者简单地将

energy

写成：

energy = 0.5 * mass * velocity ** 2

---

Python 2.7默认为整数除法，因此

energy=1/2*mass*vellocity**2

相当于

energy=（1//2）*质量*速度**2=0*质量*速度**2=0

。在确定流体运动阻力的公式中，阻力系数可用

S*Cx

表示：

0.5*rho*S*Cx*速度**2

（其中

rho

为大气密度）。当

质量*重力==阻力
时达到终点速度。由于所有这些都与速度平方有关，积分需要一点数学知识；）相关：以及