1. Gravity (Force of Attraction):
* Direction: Always downwards, towards the center of the Earth.
* Effect: Pulls the ball towards the ground.
* Importance: Without gravity, the ball wouldn't roll; it would simply float!
2. Normal Force:
* Direction: Perpendicular to the surface the ball is rolling on.
* Effect: Pushes back against the force of gravity, preventing the ball from sinking into the surface.
* Importance: Provides the necessary support for the ball to roll.
Additional Forces (Depending on the situation):
* Friction: Acts against the motion of the ball, slowing it down. There are two types:
* Rolling Friction: A small force acting at the point of contact between the ball and the surface.
* Air Resistance: A force opposing the motion of the ball through the air (more significant for faster-moving balls).
* Applied Force: Any external force pushing or pulling on the ball.
Important Note: A ball rolling on a flat surface experiences a *net* force of zero. This means the forces are balanced, allowing the ball to roll at a constant speed. If a force like friction is present, the ball will eventually slow down and stop.
