机械运动

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思成杜 (Author)

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两种基本的机械运动

机械运动指的是物体的位置随时间的变化,我们来看两种最基本的机械运动形式:匀速直线运动与匀加速直线运动

匀速直线运动

匀速直线运动可以理解为路径为直线且速率不变的运动.速度是单位时间内通过的路程.运动学公式是:s=vt,s是路程,v是速度,t是时间. 如实验,点击按钮1,海龟做匀速直线运动.你也可以调整速度参数来实现不同的匀速直线运动.

匀加速直线运动

加速度指的是速度的变化量与时间的比值,即速度变化率.如果一个物体运动轨迹是直线,且加速度恒定(速度均匀增加),则称为匀加速直线运动. 匀加速直线运动的运动学公式是s=0.5at^2+vt=(v+v')t/2,v'^2-v^2=2as,这些可以由图象法推导出来. 点击按钮2,物体做匀加速直线运动.你也可以调整参数中的加速度来实现不同的匀加速直线运动.

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to setup
  ca
  reset-ticks
  crt 2[setxy item who[-15 -15] item who[0 3]]
  ask turtles[ set heading 90]
end 

to goys
  loop[
    if [xcor] of turtle 1 + 0.1 > max-pxcor [stop]
    ask turtle 1[fd v * 0.0001]
    tick
  ]
end 

to goybs
  let originalv 0
  loop[
    if [xcor] of turtle 0 + 0.1 > max-pxcor [stop]
    set originalv originalv + a * 0.001
    ask turtle 0[fd originalv * 0.0001]
    tick
  ]
end

There is only one version of this model, created almost 4 years ago by 思成杜.

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