* The object does NOT apply an upward force. This is where the confusion often arises. It's easy to think the object "pushes back" against the ground, but that's not quite accurate.
* The ground applies an upward force. When the object hits the ground, it abruptly stops moving. This rapid change in velocity is due to the ground exerting a large upward force on the object. This force is called the normal force.
Here's a more detailed explanation:
1. Newton's Third Law: This law states that for every action, there is an equal and opposite reaction. When the object hits the ground, it exerts a downward force on the ground.
2. The ground responds: In accordance with Newton's Third Law, the ground exerts an equal and opposite force back on the object. This force is the normal force, and it acts upwards.
3. Stopping the object: This normal force is what causes the object to stop moving. If the force were not present, the object would continue to move through the ground.
In short: The object doesn't apply an upward force, but rather the ground applies an upward force on the object.
