What is 1st law of motion state?

The first law of motion states that a body at rest remains at rest, and a body in motion continues moving at a constant velocity unless acted upon by an external force. This law, also known as the law of inertia, establishes the principle that an object will maintain its state of motion (either at rest or in uniform motion) unless an external force compels a change in that motion.

Here's a simplified explanation of the first law of motion:

1. Object at Rest: If an object is not moving (at rest), it will remain at rest unless something else moves it. For instance, if you place a book on your table, it will stay there unless you pick it up or apply some force to move it.

2. Object in Motion: Similarly, an object in motion will keep moving in the same direction at the same speed unless an external force is applied. This means that if you roll a ball on the ground, it will continue rolling in that direction unless it hits an obstacle or you interfere with its motion in some way.

The first law of motion emphasizes the concept of inertia, which describes the resistance of an object to any change in its current state of motion. In other words, an object at rest will tend to resist being moved, while an object in motion will tend to resist changes in its velocity or direction.

It's important to note that the first law of motion assumes the absence of external forces. In reality, there are always external forces acting on objects, such as friction, gravity, and air resistance. These forces can cause objects to change their motion in different ways.

The concept of inertia is crucial in understanding many phenomena in physics and everyday life. For example, it explains why passengers in a car experience a sudden jolt when the vehicle stops abruptly, and it also plays a significant role in space travel and other areas where objects move in environments with minimal external forces.