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# What is an example of the law of inertia?

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One example of the law of inertia is that a package thrown from a plane will move as fast as the plane in the same direction. The law of gravity affects the package, and while the horizontal axis speed is the same as the plane, the vertical axis speed increases.

## Keep Learning

The law of inertia states that an object that is already moving will continue to move and the speed of the movement remains the same. The only factor that can change the speed or the direction is an unbalanced force. In a state of motion, all objects are able to resist changes.

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## Related Questions

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A good example that illustrates the law of acceleration is a car's increasing velocity. When a person pushes down the gas pedal, the car has positive acceleration. When the brakes are applied over a period of time, the vehicle accelerates in the negative direction. Another example is throwing a football. It travels in the direction of the line of action of a throw’s force at a speed that’s inversely proportional to the football’s mass and directly proportional to the force.

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Newton's First Law of Motion defines the concept of inertia. The law states that an object will remain in its original state of motion until acted upon by an outside force.

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Northwestern University explains that a ring has a higher moment of inertia than a solid disk of equal mass and outer radius because it has less mass at its center. According to the principles of inertia, bodies that have more mass at the center have lower levels of moment of inertia, which is directly related to the rate at which an object can spin.