Goal:
I want to make objects fall realistically so that I can make a puzzle game.
What stuff do I know?
The game could take place within a single large field, i.e. like Earth where we experience gravity acting in just one direction e.g. -y
An object will fall (accelerate) under its own weight, in a gravity field if it is unsupported.
Objects have mass, mass confers inertia.
Weight is the force of attraction between two objects with mass, usually a very large massive object (the Earth) and a much smaller object with little mass.
An objects spatial volume/area matters, i.e. objects don't interpenetrate (usually).
Part 1 - Simple version in space based on Newton's first law of motion
A body tends to remain at rest or continue to move in a straight line at constant velocity unless it is acted upon by an external force. This is the concept of inertia.
The simplest version of the first law we can make is classical 2-D particle kinematics, i.e. bodies in motion in zero gravity and sliding on a frictionless surface with lossless collisions and ignoring rotational dynamics.
We'll start with an object, a ball say... We'll make it a vector graphic, not a bitmap. Because we'll probably be using 'touching' from 'sensing'.
Zero the circle; go to x:0, y:0
Add a 'glide 1 secs to' a new position within the coordinate boundaries of the field (-240, 180; +240, +180).
Run it and demonstrate movement.
