Game physics is a body of simulated physics used in video games.
Learning game physics is very easy. In fact, if you have made a simple 2D game that requires anything to move then you already know some of the fundamental knowledge of game physics and it may surprise you some of the simple and easy concepts here commonly classified as "beginner" knowledge.
When most people speak about Game Physics they are almost always talking about the field of Mechanics (the field which studies the movement of objects) and related concepts and theories. This is the branch of physics that you will find in the beginning chapters of all physics books because it is the easiest to understand.
Position and Movement
'Position' and 'movement' are two interrelated concepts that are essential to mechanics. Position is a location in space. Movement is a changing of that position over time. Movement is generally described by 'speed' (the 1st differential of position in respect to time) and 'Acceleration' (the 2nd differential of position in respect to time — confusingly referred as either 'gravity' or 'friction' in Game Maker's terminology).
Forces
A force is something capable of moving an object or changing it's speed — either by increasing it or decreasing it. Although Game Maker uses the names of two well-known forces ('Gravity' and 'Friction') built-in as variables , those are in fact, as stated above, adapted representations of acceleration, and *NOT* forces. Game Maker does not define the physical concept of 'inertia' (represented and measured by 'mass') which makes the connection between force and acceleration.
Forces such as wind and magnetism you must simulate through programming yourself.
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