diff --git a/lazarus/gravity-control/project1.ico b/lazarus/gravity-control/project1.ico
new file mode 100644
index 0000000..0341321
Binary files /dev/null and b/lazarus/gravity-control/project1.ico differ
diff --git a/lazarus/gravity-control/project1.lpi b/lazarus/gravity-control/project1.lpi
new file mode 100644
index 0000000..3afe492
--- /dev/null
+++ b/lazarus/gravity-control/project1.lpi
@@ -0,0 +1,79 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<CONFIG>
+  <ProjectOptions>
+    <Version Value="9"/>
+    <General>
+      <SessionStorage Value="InProjectDir"/>
+      <MainUnit Value="0"/>
+      <Title Value="project1"/>
+      <ResourceType Value="res"/>
+      <UseXPManifest Value="True"/>
+      <Icon Value="0"/>
+    </General>
+    <i18n>
+      <EnableI18N LFM="False"/>
+    </i18n>
+    <VersionInfo>
+      <StringTable ProductVersion=""/>
+    </VersionInfo>
+    <BuildModes Count="1">
+      <Item1 Name="Default" Default="True"/>
+    </BuildModes>
+    <PublishOptions>
+      <Version Value="2"/>
+    </PublishOptions>
+    <RunParams>
+      <local>
+        <FormatVersion Value="1"/>
+      </local>
+    </RunParams>
+    <RequiredPackages Count="1">
+      <Item1>
+        <PackageName Value="LCL"/>
+      </Item1>
+    </RequiredPackages>
+    <Units Count="2">
+      <Unit0>
+        <Filename Value="project1.lpr"/>
+        <IsPartOfProject Value="True"/>
+      </Unit0>
+      <Unit1>
+        <Filename Value="unit1.pas"/>
+        <IsPartOfProject Value="True"/>
+        <ComponentName Value="Form1"/>
+        <ResourceBaseClass Value="Form"/>
+        <UnitName Value="Unit1"/>
+      </Unit1>
+    </Units>
+  </ProjectOptions>
+  <CompilerOptions>
+    <Version Value="11"/>
+    <Target>
+      <Filename Value="project1"/>
+    </Target>
+    <SearchPaths>
+      <IncludeFiles Value="$(ProjOutDir)"/>
+      <UnitOutputDirectory Value="lib/$(TargetCPU)-$(TargetOS)"/>
+    </SearchPaths>
+    <Linking>
+      <Options>
+        <Win32>
+          <GraphicApplication Value="True"/>
+        </Win32>
+      </Options>
+    </Linking>
+  </CompilerOptions>
+  <Debugging>
+    <Exceptions Count="3">
+      <Item1>
+        <Name Value="EAbort"/>
+      </Item1>
+      <Item2>
+        <Name Value="ECodetoolError"/>
+      </Item2>
+      <Item3>
+        <Name Value="EFOpenError"/>
+      </Item3>
+    </Exceptions>
+  </Debugging>
+</CONFIG>
diff --git a/lazarus/gravity-control/project1.lpr b/lazarus/gravity-control/project1.lpr
new file mode 100644
index 0000000..58c35dc
--- /dev/null
+++ b/lazarus/gravity-control/project1.lpr
@@ -0,0 +1,21 @@
+program project1;
+
+{$mode objfpc}{$H+}
+
+uses
+  {$IFDEF UNIX}{$IFDEF UseCThreads}
+  cthreads,
+  {$ENDIF}{$ENDIF}
+  Interfaces, // this includes the LCL widgetset
+  Forms, Unit1
+  { you can add units after this };
+
+{$R *.res}
+
+begin
+  RequireDerivedFormResource:=True;
+  Application.Initialize;
+  Application.CreateForm(TForm1, Form1);
+  Application.Run;
+end.
+
diff --git a/lazarus/gravity-control/project1.res b/lazarus/gravity-control/project1.res
new file mode 100644
index 0000000..e994dfa
Binary files /dev/null and b/lazarus/gravity-control/project1.res differ
diff --git a/lazarus/gravity-control/unit1.lfm b/lazarus/gravity-control/unit1.lfm
new file mode 100644
index 0000000..f5e71f6
--- /dev/null
+++ b/lazarus/gravity-control/unit1.lfm
@@ -0,0 +1,31 @@
+object Form1: TForm1
+  Cursor = crCross
+  Left = 167
+  Height = 526
+  Top = 217
+  Width = 830
+  Caption = 'Form1'
+  ClientHeight = 526
+  ClientWidth = 830
+  OnMouseMove = FormMouseMove
+  LCLVersion = '1.6.2.0'
+  object Shape1: TShape
+    Left = 134
+    Height = 65
+    Top = 123
+    Width = 65
+    Shape = stCircle
+  end
+  object Timer1: TTimer
+    Interval = 5
+    OnTimer = Timer1Timer
+    left = 17
+    top = 10
+  end
+  object Timer2: TTimer
+    Interval = 50
+    OnTimer = Timer2Timer
+    left = 56
+    top = 9
+  end
+end
diff --git a/lazarus/gravity-control/unit1.pas b/lazarus/gravity-control/unit1.pas
new file mode 100644
index 0000000..40b8a27
--- /dev/null
+++ b/lazarus/gravity-control/unit1.pas
@@ -0,0 +1,86 @@
+unit Unit1;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, ExtCtrls;
+
+type
+
+  { TForm1 }
+
+  TForm1 = class(TForm)
+    Shape1: TShape;
+    Timer1: TTimer;
+    Timer2: TTimer;
+    procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
+    procedure Timer1Timer(Sender: TObject);
+    procedure Timer2Timer(Sender: TObject);
+  private
+    { private declarations }
+  public
+    { public declarations }
+  end;
+
+const
+  G = 1000000;
+
+var
+  Form1: TForm1;
+  mx: double = 0;
+  my: double = 0;
+  x: double = 200;
+  y: double = 200;
+  vx: double = 0;
+  vy: double = 0;
+
+implementation
+
+{$R *.lfm}
+
+procedure TForm1.FormMouseMove(Sender: TObject; Shift: TShiftState; X,
+  Y: Integer);
+begin
+  mx := x;
+  my := y;
+end;
+
+procedure TForm1.Timer1Timer(Sender: TObject);
+var
+  dx, dy, d: double;
+  ax, ay: double;
+  t, r: double;
+begin
+  dx := mx - x;
+  dy := my - y;
+  d := sqrt(dx*dx + dy*dy);
+  t := Timer1.Interval/1000;
+  r := Shape1.Width/2;
+
+  ax := G*dx/(d*d*d);
+  ay := G*dy/(d*d*d);
+
+  if d < 10 then begin ax:=0; ay:=0; end;
+
+  vx := vx + ax*t;
+  vy := vy + ay*t;
+
+  x := x + vx*t;
+  y := y + vy*t;
+
+  if x < r then begin x:=r; vx:=abs(vx); end;
+  if x > ClientWidth-r then begin x:=ClientWidth-r; vx:=-abs(vx); end;
+  if y < r then begin y:=r; vy:=abs(vy); end;
+  if y > ClientHeight-r then begin y:=ClientHeight-r; vy:=-abs(vy); end;
+end;
+
+procedure TForm1.Timer2Timer(Sender: TObject);
+begin
+  Shape1.Left := round(x - Shape1.Width/2);
+  Shape1.Top  := round(y - Shape1.Height/2);
+end;
+
+end.
+