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# What is the difference between static and dynamic loads?

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Static loads are loads that exert a constant amount of force, while dynamic loads exert varying amounts of force upon the structure that is upholding them. A simple example of a static load is the weight of a bridge span upon the bridge pilings holding it aloft. A truck moving across that same bridge span would be exerting a dynamic load on the pilings.

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Other examples of dynamic loads include wind blowing on the face of a building, water sloshing in a jar and dice bouncing up and out of a can. The variations of dynamic loads can be due to changes in mass, direction of movement, pressure or speed of movement.

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## Related Questions

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Inertia is a scalar, something that only has a magnitude, and is defined as the resistance of an object to its state of motion, which also includes the state of rest. An object's mass is a measure of its inertia. Momentum is a vector, something that has a magnitude and direction. It's a measure of an object's motion and is dependent on the product of an object's mass and velocity.

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The difference between hydraulics and pneumatics is the medium used in each system to perform work. Hydraulics employ fluids, such as oils, while pneumatics utilize compressed gases, such as carbon dioxide or atmospheric air.

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Energy can be defined as the capacity to do work or accomplish a physical action like running, while power is the rate at which energy is transmitted or work is done. The unit of measurement for energy is Joules, calories or ergs. Power's unit of measurement is Watts, which is ergs per second or Joules per second.