- Edited
Inertia
“Newton's First Law of Motion, also known as the Law of Inertia, states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. “via google seach and Khan acadeny
Why and does gravity have a role?
When it is in a frame of reference deemed to be non moving, that is not accelerating, remaining with same velocity as the observer; the background too is considered as having the same state of apparently stationary motion as the observed object.
When the object is seen to be moving relative to the background. some of the background moves with the object and some not. Take planet Earth , loose things collected on the surface, things in the air like planes and birds, the atmosphere, sound waves in the air, the base medium and waves within it, allowing there to be forces and transmission of electromagnetism such as visible ‘light’ and radio on Earth, which is no different because of it. Everywhere under the influence of gravity moves with the Earth as it moves. The same will apply to smaller gravitational masses, such as a ball.
Starting or stopping motion, is because of this effect of gravity, not just reliant on the force necessary to move, or stop from moving, the object mass itself, but the object mass and everything influenced by it. GETTING AN OBJECT MOVING OR STOPPING IT MOVING IS MORE DIFFICULT THAN IT IS THOUGHT IT OUGHT TO BE.