## THE REALITY, NOW AND UNDERSTANDING

### DROP.TXT

#### 1.0 INTRODUCTION

This document describes the program DROP
The document consists of three parts:

Description
Operation
Technical Description

This program is part of chapter 2

#### 2.0 DESCRIPTION

The purpose of this program is to simulate the movement of an free falling object on Earth under two conditions:

Without friction
With friction

On Earth the following rules apply:

Acceleration (g) is constant
v will increase or decrease linear
distance (height) will increase or decrease quadratic.

When there is no friction and the object reaches the Earth then the object will bounce back (in the opposite direction) with the same speed.

This process of bouncing will then continue forever.

Now perform the program: DROP.EXE
From the Test Selection Display:

Select test 1
Select S (Start)

When there is friction and the object reaches the Earth then the object will bounce back (in the opposite direction) with a lower speed. The amount with which the speed is reduced is a function of how much energy is transferred to the earth in the form of, for example, heat.

After each bounce the speed will be reduced, until finally to zero.

Now perform the program: DROP.EXE
From the Test Selection Display:

Select test 2
Select S (Start)

Return back CHAPTER2.TXT

#### 3.0 OPERATION

The program uses one standard feature:

When you select Esc you will terminate the program (Escape)

On the top right corner of the display are indicated the height, speed and acceleration.

In order to make the simulation better visible, the object also has an horizontal speed.

The bottom part of the display show the speed.

In order to simulate the different conditions the parameter selection display is used

#### 3.1 PARAMETER SELECTION DISPLAY

From the Parameter Selection Display the following parameters can be changed:

```        0 = Select test display

1 = Set standard parameters.

2 = Screen mode. Valid values are 7,8,9 and 12. Standard value = 9
3 = Wait time in second. Physical wait time between each simulation
cycle. Standard value = 0.6
4 = Friction. Standard value = 1
0 means no friction

5 = Delta time in seconds between each calculation cycle.
Standard value is 0
```