Q:

# Which has more inertia, a sitting plane on a runway or a car moving?

A:

A sitting plane on a runway has a higher inertia than a moving car. In order to change the inertia of rest of the sitting plane, significantly more energy is required than to change the inertia of motion of the moving car.

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This concept of inertia can be explained from Newton's Laws of Motion. The value of force to move a static object or to stop a moving object is equal to the product of mass and acceleration. The mass of the plane sitting on a runway is much more than that of a car. Thus it has a higher inertia of rest than the inertia of motion of the moving car.

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