Suppose the weight of the drawbridge in the figure below is supported entirely by its hinges and the opposite shore, so that its cables are slack. (a) What fraction of the weight is supported by the opposite shore if the point of support is directly beneath the cable attachments?   (b) What is the magnitude in newtons and direction of the force the hinges exert on the bridge under these circumstances? The mass of the bridge is 2,150 kg.

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Q: A F F F 100 kg 100 kg 100 kg D E F F F 200 kg 200 kg 200 kg

A: Just use the lever principle for balance  That is  F1d1=F2d2

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Q: Determine the load in member AB of the pin-connected truss 3m 3m 1 m 4 m 2m A 81 B 15 68 KN E www

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Rotational Equilibrium And Rotational Dynamics

In physics, the state of balance between the forces and the dynamics of motion is called the equilibrium state. The balance between various forces acting on a system in a rotational motion is called rotational equilibrium or rotational dynamics. 

Equilibrium of Forces

The tension created on one body during push or pull is known as force.