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...Statics and strength of materials is the study forces acting in equilibrium on rigid bodies are solid objects like steel cables gear teeth timber beams axle shafts no liquids or gases means do not stretch bend twist accelerating we keep assumptions but drop assumption real under tension torsional load most fundamental concepts mechanics stress strain words used interchangeably i m feeling stressed a lot engineering these have specific technical meanings if you tie wire to hook ceiling hang weight lower end will divide change length by original hanging from s cross sectional area tensile ratios symbol for case greek letter sigma has units force per unit when si expressed newtons n square meters consequently pa meter that pascals however pascal such small it necessary work with large multiples usually megapascal mpa mm epsilon because normal ratio two lengths dimension less quantity therefore simply as number independent any system numerical values very bars made structural undergo only ...