5/28/2023 0 Comments Static equilibrium 3dOnce the car stops accelerating and maintains a constant velocity, that force goes away. In the static case, the equilibrium equation is. As the car accelerates forward, you would feel a force pushing you back into your seat. The equilibrium equation describes the static or dynamic equilibrium of all internal and external forces of the system. Another example of this is the experience of a passenger in an accelerating car. This is because acceleration is, in turn, always associated with some unbalanced (net) force on a body. Inside the train, you can tell that your velocity has changed because you can feel the acceleration manifested as an unbalanced force on your body. A change in velocity is always caused by an acceleration. You may start moving vertically a bit upwards after hitting the bump and then downwards again due to gravity. If you hit a bump, your velocity changes. You, and the coffee, are in static equilibrium. You can comfortably enjoy a nice cup of hot coffee without spilling it all over yourself (again, unless you hit a bump). If you are sitting in a train, moving at constant velocity, it feels just like you are sitting still (except for any bumps in the road that momentarily change your velocity). Why is this the case? According to relativity (Einstein), it is not possible to tell if an object is moving or not from the point of view of an observer on the object if that object is moving at a constant velocity. This means that it is moving at a constant velocity. Technically, a body (or structure) is in static equilibrium if it is not accelerating. >When you're done reading this section, check your understanding with the interactive quiz at the bottom of the page.
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