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.
* Constant Velocity: Constant velocity means the object is not accelerating (neither speeding up nor slowing down, nor changing direction).
* Acceleration and Force: Acceleration is caused by a net force. If there's no acceleration, there must be no net force.
However, it's important to remember that:
* Zero net force does not mean there are no forces acting on the object. There could be multiple forces acting on the object, but they cancel each other out. For example, a book sitting on a table has the force of gravity pulling it down and the normal force from the table pushing it up. These forces are equal and opposite, resulting in a net force of zero.
* Constant velocity doesn't mean the object is stationary. It can be moving at a constant speed in a straight line.
Let me know if you'd like more examples or have any further questions!
