explain newtons first law of motion

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When there is no external force is acting on an object then the object doesn't changes its state it is called newton's first law.    EX:a person standing in a bus falls backward when bus starts moving suddenly

Answer

Newton's First Law of Motion

Newton's first law of motion, also known as the law of inertia, is a fundamental principle of physics that describes the behavior of objects at rest or in motion. It states that an object will remain at rest or continue to move in a straight line at a constant velocity unless acted upon by an external force.

Key points:
- Newton's first law of motion is based on the concept of inertia, which is the tendency of an object to resist changes in its motion.
- This law applies to all objects, regardless of their size or mass.
- Inertia is a property of matter and depends on an object's mass. The greater the mass, the greater the inertia.
- The first law states that if the net force acting on an object is zero, the object will remain at rest, or if it is already in motion, it will continue to move with a constant velocity.
- Velocity is a vector quantity that includes both speed and direction. Therefore, an object can have a constant velocity even if its speed changes as long as the direction remains the same.
- The first law also implies that an object in motion will continue to move in a straight line unless acted upon by an external force.
- This law is often demonstrated by examples such as a book sliding on a frictionless table or a car coasting on a straight road with no engine power.
- In these examples, the absence of an external force, such as friction or air resistance, allows the object to maintain its state of motion.
- However, in the presence of an external force, the object's motion will change according to the magnitude and direction of that force.

Conclusion:
Newton's first law of motion provides the foundation for understanding the behavior of objects in the absence of external forces. It explains why objects at rest tend to stay at rest and why objects in motion tend to stay in motion unless acted upon by an external force. This law has numerous applications in various fields, from engineering to sports, and plays a crucial role in our understanding of the physical world.

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