What is Inertia?

All objects resist changes in their state of motion. All objects have this tendency - they have Inertia. But do some objects have more of a tendency to resist changes than others? Absolutely yes! The tendency of an object to resit changes in its state of motion varies with Mass.

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by a force. Newtons First Law of Motion.

Objects just keep on doing what they are doing.

In fact, it is the natural tendency of objects to resist change in their state of motion. This tendency to resist changes in their state of motion is described as Inertia.

All objects resist changes in their state of motion. All objects have this tendency - they have Inertia. But do some objects have more of a tendency to resist changes than others? Absolutely yes! The tendency of an object to resit changes in its state of motion varies with mass. Mass is that quantity which is solely dependent upon the Inertia of an object.

The more Inertia an object has, the more mass it has. A more massive object has a greater tendency to resist changes in its state of motion.

Maybe this analogy will help;

When a car is pulling a trailer there will be pressure on the front of the ball joint, where the trailer connects to the car, so long as the car is accelerating the trailer. In the golf stroke when we are accelerating the Clubhead there will be a force at Pressure Point #3 - we call this Lag.

As soon as the car reaches its cruising speed there will no longer be a pull on the trailer from the car and the pressure on the front of the ball joint will disappear. The pressure on the front of the ball joint senses the Inertia of the trailer.

If the trailer is fully loaded it will have large Inertia with a large pressure on the front of the ball joint. If the trailer is unloaded it will have small Inertia and with small pressure on the front of the ball joint. In this way the pressure on the ball joint can be thought of as sensing the Inertia of the trailer.

As soon as the car slows down then the trailer will push the car and the pressure will be applied to the car from the trailer via the back of the ball joint. Again a fully loaded trailer will have large Inertia and apply a large pressure to the back of the ball joint.

An unload trailer will have small Inertia and apply a small pressure to the back of the ball joint. We are aware that under this condition the trailer is no longer under the control of the car and the car-trailer system is instable.  

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