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How does statics help explain why an object remains at rest?
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physics
As conceived by Daniel Bernoulli in Hydrodynamica (1738), gases consist of numerous particles in rapid random motion. He assumed that the pressure of a gas is produced by the direct impact of the particles on the walls of the container.
In physics, statics is the subdivision of mechanics that examines bodies and structures in equilibrium, meaning they remain at rest. For an object to stay at rest, statics establishes that two primary conditions must be met:12
- Zero Net Force: The sum of all forces acting on the body must be zero, meaning all forces are perfectly balanced by contrary forces.123
- Zero Net Torque: There must be no net torque acting on the body, ensuring there is no tendency for it to rotate about any axis.12
Statics assumes that bodies are perfectly rigid, meaning any slight deformations are neglected in calculations. By using these equilibrium equations, engineers and scientists can identify unknown forces acting on structures, such as buildings or bridges, to ensure they remain stable and stationary. If a body is not accelerated, it is deduced that no net force is acting upon it, confirming its state of equilibrium.123