Correct option is D
Inertia is the property of an object that resists changes in its state of motion or rest. According to
Newton’s First Law of Motion (Law of Inertia):
"An object at rest stays at rest, and an object in motion stays in motion with the same speed and direction unless acted upon by an external force."
The inertia of an object depends
only on its mass—the greater the mass, the greater the inertia. This means a
heavier object requires
more force to change its motion compared to a lighter object.
Important Points:
·
Inertia is a fundamental concept in Newtonian mechanics.
· It is the reason why
seatbelts are necessary in cars (they prevent passengers from moving forward suddenly during braking).
· Inertia is independent of speed, acceleration, or volume.
· The
moment of inertia extends this concept to rotational motion.
