Answer:
While your statement captures some aspects of the motion of a thrown object, there are a few important clarifications to be made.
When an object is thrown, the thrower imparts an initial force on the object. According to Newton's first law of motion, an object in motion tends to stay in motion with the same velocity unless acted upon by an external force. In this case, the initial force from the thrower starts the object's motion and imparts an initial velocity.
Inertia, as described by Newton's first law, plays a role in keeping the object moving horizontally. It is the tendency of an object to resist changes in its velocity. Therefore, once the object is in motion, it will continue moving horizontally at a constant velocity unless acted upon by external forces.
Gravity, on the other hand, is a downward force that acts on the object. It causes the object to accelerate vertically towards the Earth. This acceleration is known as free fall acceleration, and it is approximately 9.8 m/s^2 on the Earth's surface. The force of gravity acts vertically downward and has no direct influence on the horizontal motion of the object.
These two motions, the horizontal motion due to inertia and the vertical motion due to gravity, occur independently but simultaneously. As a result, the combined effect of the two motions causes the object's path to curve downward. This curved path is known as a parabolic trajectory and is characteristic of projectiles in motion under the influence of gravity.
In summary, the horizontal motion of the thrown object is due to inertia, while the vertical motion is influenced by the force of gravity. The interaction of these two motions results in a curved downward trajectory for the object.