初级物理模型的构建（AS）-力学1 力学条件下的圆周运动

function normal_vector(mc) {

// 求MC1沿顺时针绕MC2转的法向向量。

mc.VdirectionX = mc.ForcedirectionY;

mc.VdirectionY = -mc.ForcedirectionX;

}

#include "Physics.as"

_root.onLoad = function() {

ball1.ForcedirectionX(0);

ball1.ForcedirectionY(0);

ball1.VdirectionX(0);

ball1.VdirectionY(0);

ball1.CreateBasicPhysicsFeature(5, 0, 0, 0);

ball2.CreateBasicPhysicsFeature(10, 0, 0, 0);

ball1.CreateExtendMotionFeature(0, 0, 0, 0);

ball1.ForcedirectionX(0);

ball1.ForcedirectionY(0);

G = 1000;

}

///***Fundamental Function***///

function Getdistance(mc1, mc2) {

return Math.sqrt((mc1._x-mc2._x)*(mc1._x-mc2._x)+(mc1._y-mc2._y)*(mc1._y-mc2._y));

}

function StardandlizeAngle(mc1, mc2) {// b)计算出MC1到MC2的方向向量：

var l = Getdistance(mc1, mc2);

mc1.ForcedirectionX = (mc2._x-mc1._x)/l;

mc1.ForcedirectionY = (mc2._y-mc1._y)/l;

}

function normal_vector(mc) {

// 求MC1沿顺时针绕MC2转的法向向量。

mc.VdirectionX = mc.ForcedirectionY;

mc.VdirectionY = -mc.ForcedirectionX;

}

///***Combine Function***///

function doForce_n() {

r = Getdistance(ball1, ball2);

var Force_n = G*ball1.m*ball2.m/(r*r);

ball1.v = Math.sqrt(Force_n*r/ball1.m);//根据向心力求匀速圆周运动速度

}

function doMove_Circle() {

StardandlizeAngle(ball1, ball2);

normal_vector(ball1);

ball1.vx = ball1.v*ball1.VdirectionX;

ball1.vy = ball1.v*ball1.VdirectionY;

ball1._x += ball1.vx;

ball1._y += ball1.vy;

}

_root.onEnterFrame = function() {

doForce_n();

doMove_Circle();

};