An object at rest will stay at rest, and an object in motion will stay in motion at a constant velocity (speed and direction) unless acted upon by an unbalanced force.
Here's the breakdown:
* "An object at rest will stay at rest" means that if an object is not moving, it will continue to not move unless something pushes or pulls on it.
* "An object in motion will stay in motion at a constant velocity" means that if an object is moving, it will continue to move at the same speed and in the same direction unless something pushes or pulls on it.
* "Unless acted upon by an unbalanced force" is crucial. Forces come in pairs, and if they are balanced, they cancel each other out. Only an unbalanced force will cause a change in motion.
The concept you mentioned about "force being equal to its propelling force" is related to Newton's Second Law of Motion, not the first. This law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. In simpler terms, the greater the force, the greater the acceleration, and the larger the mass, the smaller the acceleration.
Let me know if you have any more questions!
