## Law of Inertia – Class 11 | Chapter – 5 | Physics Short Notes Series PDF for NEET & JEE

Law of Inertia: The Law of Inertia, also known as Newton’s First Law of Motion, states that an object at rest will remain at rest, and an object in motion will remain in motion with a constant velocity, unless acted upon by an external force. In other words, objects will continue to do what they are already doing, whether that is staying still or moving in a straight line at a constant speed, unless an outside force acts on them.

## Importance of Law of Inertia

The Law of Inertia, also known as Newton’s First Law of Motion, is important for several reasons:

• Foundation for understanding motion: This law provides a foundation for understanding how objects behave in the absence of external forces. It helps explain why objects at rest stay at rest and why objects in motion continue to move in a straight line at a constant speed.
• Basis for Newton’s other laws of motion: This law is the first of three laws of motion developed by Sir Isaac Newton. It provides the foundation for the other two laws and helps explain the relationship between force, mass, and acceleration.
• Applications in engineering and mechanics: The Law of Inertia is relevant in a variety of fields, including physics, engineering, and mechanics. It is used to design and build machines, vehicles, and structures that can withstand the forces and stresses they will encounter.
• Safety considerations: The Law of Inertia is also important for safety considerations. It helps explain why passengers in a car or airplane must wear seat belts, and why objects should be secured during transportation. Without the Law of Inertia, it would be difficult to predict how objects and people would behave in various situations.

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