* Rest: The ball is stationary and not moving.
* Constant Velocity: The ball is moving at a constant speed in a straight line.
Here's why:
* Newton's First Law of Motion: This law states that an object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
* Zero Net Force: When the sum of all forces is zero, it means there's no unbalanced force acting on the ball to change its state of motion.
Examples:
* A ball hanging from a string: The force of gravity pulling the ball down is balanced by the tension force in the string pulling the ball up.
* A ball rolling on a frictionless surface: Once the ball is set in motion, there's no force to slow it down, so it continues rolling at a constant speed.
Important Note: Just because the sum of forces is zero doesn't mean the ball isn't experiencing any forces. It just means the forces are all balanced, resulting in no net change in motion.
