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The object changes its speed, its direction of motion, or both.
Quite simply, there is no such thing as an "immovable object" or an "unstoppable force". In general, what happens when a force acts on an object is described by Newton's Second Law.
If there is no net force, the object will stay at rest if it was at rest, or continue moving - at constant velocity - if it was already moving.
changes the motion of the object
Then one force is overcoming another force, and the object moves.
A change in momentum exists whenever a force acts on an object, and the magnitude of the change is dependent on the mass of the object on which the force acts.
It accelerates.
Nothing changes. When no force acts on an object moving with constant velocity, the body continues its motion with uniform velocity, or if the object is at rest, it will remain at rest.
The object changes its speed, its direction of motion, or both.
If a force is being applied to a moving object, it will change its velocity (it will accelerate) appropriately.
Quite simply, there is no such thing as an "immovable object" or an "unstoppable force". In general, what happens when a force acts on an object is described by Newton's Second Law.
If there is no net force, the object will stay at rest if it was at rest, or continue moving - at constant velocity - if it was already moving.
I am not quite sure what you mean with "fixed". If you mean the object is fixed in its position, or unmovable, such a thing doesn't exist in the real world. Whenever a force acts on an object, its movement will change, according to Newton's Second Law (acceleration = force / mass).
changes the motion of the object
A push or pull that acts on an object is a force.
Then one force is overcoming another force, and the object moves.
Then one force is overcoming another force, and the object moves.