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The law of inertia is often referred to as Newton’s first law of motion. This law is one of the foundational concepts in classical mechanics and was formulated by Sir Isaac Newton in the 17th century.

Inertia is often summarized by the statement:

“An object at rest tends to stay at rest, and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an external force.”

Inertia can be categorized into three main types:

The inertia of Rest: This refers to the tendency of an object to remain at rest when no external force is acting on it. In other words, an object at rest will stay at rest unless a force is applied to set it in motion.

Example: A book sitting on a table will not move on its own because it exhibits inertia of rest. It requires an external force, such as someone pushing it, to overcome this inertia and make it move.

The inertia of Motion: This describes the tendency of an object in motion to remain in motion with the same speed and in the same direction unless acted upon by an external force. It is sometimes referred to as “inertia of motion” or simply “inertia.”

Example: If you roll a ball on a smooth, frictionless surface, it will continue rolling indefinitely in a straight line unless an external force, such as friction or your hand, acts upon it to slow it down or change its direction.

Inertia of Direction: Inertia of direction is a concept related to an object’s tendency to resist changes in its direction of motion. This means that an object will continue moving in its current direction unless an external force is applied to change that direction.

Example: When you’re driving a car and suddenly make a sharp turn, you feel yourself being pushed to the side. This is because your body tends to continue moving in the direction it was initially going (inertia of motion), and the car’s rapid change in direction exerts a force on you (inertia of direction).


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Topics Covered:
00:00 Three Examples Of the Law of Inertia In Daily Life
00:19 First, Dust Particles in Woolen Blanket 🧶 (Inertia of Rest)
00:46 Second, Athlete Taking a Long Jump 🏃‍♀️ (Inertia of Motion)
01:20 Third, The Car Turning on a Curve 🚗 (Inertia Of Direction)