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If you are in a car and you brake, the car slows down and then you stop. slowing down is an effect of inertia. When you are running and want to stop, you first have to slow down before you stop moving your legs or else you will trip and fall on your face. Slowing down is an effect of inertia.

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Inertia is the resistance of any physical object to a change in its state of motion or rest, or the tendency of an object to resist any change in its motion.

Newtons 3rd law.

When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction to that of the first body.

This is a technical description of inertia but simply put it's the resistance to movement of an object. Overcome the inertial mass of an object and it will move or it will stop or it will change direction.

So, a common effect of inertia. Well when you drive a car you are storing inertial energy. if you hit a brick wall all that energy has to be dissipated (you cannot create or destroy energy you can only change its state). Therefore the energy is absorbed by the car, the objects in the car and the wall. We call this a car crash.

If we could build a car which had a magic circuit in it which could defeat inertia then car crashes wouldn't happen any more. If you hit the wall you would just ... stop... Nobody would continue to travel through the windscreen and there would be no damage to the wall the car or the passengers because they would not be subject to acceleration (inertial) and deceleration forces. Not only that but the car would be capable of crazy U-turns and even instantaneously reversing direction.

Unfortunately Star treks inertial dampers has not been invented... yet!

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12y ago

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