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Course: Class 11 Physics (India)>Unit 13

Lesson 1: Stress, strain, and modulus of elasticity

Young's modulus of elasticity

In this video let's explore this thing called 'Young's modulus' which gives a relationship between the stress and strain for a given material. Created by Mahesh Shenoy.

Want to join the conversation?

• Not a question but your handwriting is phenomenal! Great lesson as well!
• Is stress proportional to strain and strain proportional to stress the same thing?
• Yeah. Both are the same. Although the better way to say that is that Stress is proportional to Strain since strain generates stress and not the other way round.
(1 vote)
• Does changing the cross sectional area of a wire affect its ultimate tensile stress? (provided the young's modulus of the wire is constant)
• Yes it will affect bcoz from formulae we can see S=F/A that stress is inversely proportional to area
• stress and tensile stress can be taken as the same thing?(as in a rubber band pulling horizontally and in a rod from a ceiling being pushed down?)
• no because there are many different stress too like shearing stress which doesnt change length and bring longitudinal change. you may watch videos on shearing stress to understand it better
• OK so force divided by area is pressure
• In a different context that is true.
I would like to inform you that Pressure is a term used for fluids and Stress in a similar way for solids.
• How does stress indicate how quickly a wire or band snaps back to its original state when the stress is a quantity of restoring force per unit area and not per unit of time?