Chapter 9: Statics and Torque

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11 Terms

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center of gravity

the point where the total weight of the body is assumed to be concentrated

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dynamic equilibrium

a state of equilibrium in which the net external force and torque on a system moving with constant velocity are zero

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mechanical advantage

the ratio of output to input forces for any simple machine

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neutral equilibrium

a state of equilibrium that is independent of a system’s displacements from its original position

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perpendicular lever arm

the shortest distance from the pivot point to the line along which F lies

<p>the shortest distance from the pivot point to the line along which F lies</p>
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SI units of Torque

newton times meters, usually written as N·m

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Stable Equilibrium

a system, when displaced, experiences a net force or torque in a direction opposite to the direction of the displacement

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Static Equilibrium

a state of equilibrium in which the net external force and torque acting on a system is zero; equilibrium in which the acceleration of the system is zero and accelerated rotation does not occur

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Torque

turning or twisting effectiveness of a force

<p>turning or twisting effectiveness of a force</p>
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Unstable Equilibrium

a system, when displaced, experiences a net force or torque in the same direction as the displacement from equilibrium

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Conditions to achieve Equilibrium

  1. net external force on the system must be zero

  2. The net external torque on a system must be zero