Here's why:
* Gravity is a universal force: It attracts any two objects with mass towards each other. The Earth has a large mass, so it exerts a strong gravitational pull on objects near its surface, including apples.
* Acceleration due to gravity: This force causes the apple to accelerate towards the Earth at a constant rate of approximately 9.8 meters per second squared.
* Motion: This acceleration causes the apple's velocity to increase as it falls, resulting in its downward motion.
While other forces like air resistance might play a minor role, gravity is the primary force responsible for the apple's fall.
