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the tendency of an object to resist a change in its motion

Inertia and Mass are related

because the greater the mass of an object, the greater its inertia.

Inertia affects a human in a car crash

because of their inertia, they are still traveling at the car's original speed of perhaps 50 km/h.

When object moves through air

it does not accelerate or slow down.

An object can be at rest

when forces are balanced.

as the object's velocity changes

Inertia of an object does not change

an object in motion stays in motion

unless it hits something, it is catched or stops from gravity

an object at rest stays at rest

unless an unbalanced force acts upon it

Yes, but they are balanced

Are forces acting on an object that is at rest?

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