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# What is hoop stress?

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Hoop stress is a stress in a pipe wall. It is represented by the forces inside the cylinder acting towards the circumference perpendicular to the length of the pipe.

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Hoop stress is derived from Newton's first law of motion. Conceptually, the amount of internal pressure produced must be equal to the stress around the wall of the cylinder to maintain equilibrium and for objects to remain at rest. If forces inside a cylinder are simplified, another stress called longitudinal stress is derived. It is a force pushing against both ends of the pipe. These forces are measured in newtons per square meter (N/m*m) or pascals (Pa).

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## Related Questions

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Acceleration shows the changes in the magnitude and direction of velocity. It is a vector with a standard unit of meters per second squared.

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Inertia is what causes an object to maintain its state of motion. According to the Physics Classroom, Newton's first law of motion states that 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 an unbalanced force. This means objects tend to keep doing what they are already doing.

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The equations postulated by Newton according to his three laws of motion are applicable in projectile motion. These are: "S = Vit + 1/2at2," "Vf = Vi + at" and "2aS = Vf2 - Vi2," where "S" is the distance covered, "Vf" is the final velocity, "Vi" is the initial velocity, "t" is time, and "a" is acceleration. In this motion, acceleration (a) can be replaced by gravity (g).