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SinghRP
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What is inertia? What is its source? Is inertial mass mass? Do gravitational mass and inertial mass have the same sign?
Inertia is the tendency of an object to resist changes in its state of motion. This means that an object at rest will remain at rest, and an object in motion will continue moving in the same direction and at the same speed, unless acted upon by an external force.
The source of inertia is mass. The more mass an object has, the more inertia it has. This is why larger objects require more force to start moving or to change their speed or direction.
Newton's First Law of Motion states that an object will remain at rest or in motion at a constant velocity unless acted upon by an external force. This is essentially describing the concept of inertia, as an object will only change its state of motion if an external force is applied to overcome its inertia.
Yes, inertia can be measured by calculating an object's mass. Mass is a measure of the amount of matter an object contains, and as mentioned before, the more mass an object has, the more inertia it has.
In space, where there is no air resistance or other external forces, objects will continue moving in a straight line at a constant speed due to their inertia. This is why astronauts in space must use thrusters to change their direction or speed, as there is no air drag to slow them down.