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Boundless Physics
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Physics

Chapter 8

Static Equilibrium, Elasticity, and Torque

Book Version 3
By Boundless
Boundless Physics
Physics
by Boundless
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Section 1
Introduction
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Torque

Torque is the force that causes objects to turn or rotate (i.e., the tendency of a force to rotate an object about an axis).

Section 2
Conditions for Equilibrium
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First Condition

The first condition of equilibrium is that the net force in all directions must be zero.

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Second Condition

The second condition of static equilibrium says that the net torque acting on the object must be zero.

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Two-Component Forces

In equilibrium, the net force and torque in any particular direction equal zero.

Section 3
Stability
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Stability, Balance, and Center of Mass

An object in static equilibrium remains in the same state forever, but not all forms of equilibrium are the same.

Section 4
Solving Statics Problems
Problem-Solving Techniques

When solving static problems, you need to identify all forces and torques, confirm directions, solve equations, and check the results.

Section 5
Applications of Statics
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Simple Machines

A simple machine is a device that changes the direction of a force or augments a force; simple machines fall into six categories.

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Arches and Domes

Arches and domes are structures that exhibit structural strength and can span large areas with no intermediate supports.

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Muscles and Joints

Most skeletal muscles and joints exert much larger forces within the body than the limbs will apply to the outside world.

Section 6
Elasticity, Stress, Strain, and Fracture
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Elasticity, Stress, and Strain

Elasticity is a measure of how much an object deforms (strain) when a given stress (force) is applied.

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Fracture

Fracture is caused by a strain placed on an object such that it deforms beyond its elastic limit and breaks.

Section 7
The Center of Gravity
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Center of Gravity

The center of gravity is read mathematically as: 'the position of the center of mass and weighted average of the position of the particles'.

Section 8
Torque and Angular Acceleration
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Relationship Between Torque and Angular Acceleration

Torque is equal to the moment of inertia times the angular acceleration.

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Boundless Physics by Boundless
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Linear Momentum and Collisions
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Static Equilibrium, Elasticity, and Torque
  • Introduction
  • Conditions for Equilibrium
  • Stability
  • Solving Statics Problems
  • Applications of Statics
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Rotational Kinematics, Angular Momentum, and Energy
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