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An object's motion is affected by the initial speed and acceleration and the forces that interact with it, the most important being:
Gravity - that is affected by the gravitational constant g - which is affected by altitude;
Air friction - that depends on the speed of the object and it's volume and air density;
Surface friction - depends on the size of the surface of contact, the force that the object exerts on the surface, the surface and the object's coefficient of friction;
All the above forces are proportional to the mass of the object.
Acceleration aka Force, and Mass

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