https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-stress-strain-and-modulus-of-elasticity/v/elastic-and-non-elastic-materials 2020-06-23T07:22:42Z Elastic and non elastic materials Is steel more elastic than rubber? We all have some intuition for elastic and non-elastic materials. But how do we define elasticity? How do we say whether something is more or less elastic? In this video, we will explore the true meaning of elasticity. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/Rtkj_VLPYkprE1kpX9ckJ8vfJLG_b2xO5AsZDCB3HXdvgox5p9B_dk7z6gIlTXw54AZ0q12mUqM3eBDhtWTV-xfUBA Elastic and non elastic materials Is steel more elastic than rubber? We all have some intuition for elastic and non-elastic materials. But how do we define elasticity? How do we say whether something is more or less elastic? In this video, we will explore the true meaning of elasticity. https://cdn.kastatic.org/ka-youtube-converted/PUB_gAm4LCA.mp4/PUB_gAm4LCA.mp4 711 Mechanical properties of solids https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-stress-strain-and-modulus-of-elasticity/v/stress-strain 2020-06-23T07:22:42Z Stress & strain To measure the elasticity of any material we need to define two quantities. Stress and strain. In this video let's explore what these are and why we define them? Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/YCoOUe1idxESFgf-aitl5nw25axV3gg6gphtA369wsfAXZqYI7e8-g5RjIZ_uBPIPxnOh5aroIPktonY0KeEIFD0 Stress & strain To measure the elasticity of any material we need to define two quantities. Stress and strain. In this video let's explore what these are and why we define them? https://cdn.kastatic.org/ka-youtube-converted/Ncode2Fsqq0.mp4/Ncode2Fsqq0.mp4 636 Mechanical properties of solids https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-stress-strain-and-modulus-of-elasticity/v/youngs-modulus-of-elasticity 2020-06-23T07:22:41Z 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. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/rREyZfyhbzaVbASGYZnV5DJx1GKnMDCjo0licFzXOPYWEgRS9369CJ_-rVwJ0Emk7F32wYmi97tOUBAO37vrUVzilQ 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. https://cdn.kastatic.org/ka-youtube-converted/jr_UPRZV8hQ.mp4/jr_UPRZV8hQ.mp4 679 Mechanical properties of solids https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-stress-strain-and-modulus-of-elasticity/v/solved-example-stress-and-strain 2020-06-23T07:22:42Z Solved example: Stress and strain In this video, we will solve a numerical on calculating strain.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/0_MzM8_gCwEUkah1dqH0WDjNcskohH7HxTtAfi9YURFvc1kUCvVWPczftX4zdqb7KXGZHuyl4ig_FxMTnq9MLgu6 Solved example: Stress and strain In this video, we will solve a numerical on calculating strain.  https://cdn.kastatic.org/ka-youtube-converted/BTqGWmV0Jis.mp4/BTqGWmV0Jis.mp4 540 Mechanical properties of solids https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-stress-strain-and-modulus-of-elasticity/e/stress-and-strain 2025-03-28T20:44:29.717561562Z Stress and Strain Let's solve some questions vibhor exercise https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-stress-strain-and-modulus-of-elasticity/v/solved-example-strength-of-femur 2020-06-23T07:22:41Z Solved example: strength of femur How much weight can our thigh bone withstand? In this video, we will calculate the maximum force our thigh bone can withstand. The answer may surprise you.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/VPwQ0_xsyfIMRaE6ZOzKS8B9Q-cqO8Zvc5-YU5uks9ylbb1dxkaM-1N5rnhINjkk7xpST4jm-_CLnSpIWcutXfetGw Solved example: strength of femur How much weight can our thigh bone withstand? In this video, we will calculate the maximum force our thigh bone can withstand. The answer may surprise you.  https://cdn.kastatic.org/ka-youtube-converted/kTp-MsrwYvg.mp4/kTp-MsrwYvg.mp4 362 Mechanical properties of solids https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-stress-strain-and-modulus-of-elasticity/v/stress-vs-strain-curve 2020-06-23T07:22:40Z Stress vs strain curve What happens if you stretch something beyond its elastic limits? In this video, we will explore the regions beyond the elastic limits. We will take a steel rod and keep stressing it until it breaks. We will draw a graph of stress vs strain and explore all the different regions of it.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/d48iB8aFNlb7DFFvKB7dxSSa_qWv9HXsXAwffNYbqjnTp5lA4o59xbu2yfjyrvysJjPirGum47BsCDN96mpc7fFIKw Stress vs strain curve What happens if you stretch something beyond its elastic limits? In this video, we will explore the regions beyond the elastic limits. We will take a steel rod and keep stressing it until it breaks. We will draw a graph of stress vs strain and explore all the different regions of it.  https://cdn.kastatic.org/ka-youtube-converted/eW5ICEtjN4w.mp4/eW5ICEtjN4w.mp4 775 Mechanical properties of solids https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-stress-strain-and-modulus-of-elasticity/e/stress-and-strain-curve 2026-04-07T22:23:57.656416987Z Stress and strain curve Checks understanding of various regions on the stress-strain curve, and elastic properties of materials. srijan exercise https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-stress-strain-and-modulus-of-elasticity/e/elastic-potential-energy 2025-05-22T20:00:19.681517034Z Elastic Potential Energy Elastic Potential Energy Chandan Ganotra exercise https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-shear-and-bulk-stress/v/shear-stress-and-strain 2020-10-19T14:09:33Z Shear stress and strain How do we really tear paper? This seems like a silly question, but the answer is 'we shear it'. So let's explore this concept of shearing. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/sYE1tLO5M5MgREZDgrqz0k4njeLV68wpnWpJ-lKRwsN6oo1Cue0bgRZavZpFTuZeqD9K-jdUnZ3wNFfGI_Ifu_A Shear stress and strain How do we really tear paper? This seems like a silly question, but the answer is 'we shear it'. So let's explore this concept of shearing. https://cdn.kastatic.org/ka-youtube-converted/w0Xui3xC4fs.mp4/w0Xui3xC4fs.mp4 644 Mechanical properties of solids https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-shear-and-bulk-stress/v/shear-modulus 2021-02-09T20:43:42Z Shear modulus Let's explore a new modulus of elasticity called shear modulus (rigidity modulus). This will also explain why our bones are strong and yet can be fractured easily. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/Uu8h6qSazXKLEWcso2UBMMnQkBDc6HEnb2YRksMF032AEFRT-1g2-qxAypJ3i3o8gGnARCWYrUUb8z6VVncAJx7O4A Shear modulus Let's explore a new modulus of elasticity called shear modulus (rigidity modulus). This will also explain why our bones are strong and yet can be fractured easily. https://cdn.kastatic.org/ka-youtube-converted/cijR2pQhacE.mp4/cijR2pQhacE.mp4 653 Mechanical properties of solids https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-shear-and-bulk-stress/v/bulk-stress 2021-02-09T20:43:43Z Bulk stress and strain Let's explore the concept of bulk stress and bulk strain. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/ZCO8FjfUMFN9DYudHwZBpAaX0AY2ZVeyXYL3MkkAmqjJ4Eo6TzkKzVcNB-Pu943WRW0jtuCzkBmC9F7fz1SDbD8a Bulk stress and strain Let's explore the concept of bulk stress and bulk strain. https://cdn.kastatic.org/ka-youtube-converted/-R6p-Q0F7i8.mp4/-R6p-Q0F7i8.mp4 435 Mechanical properties of solids https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-shear-and-bulk-stress/v/solved-example-pressure-needed-to-compress-water 2021-02-09T20:43:43Z Solved example: pressure needed to compress water Let's solve a numerical on bulk modulus. Let's explore how easy or difficult it is to compress water in this problem-solving video. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/AZlMQxioqyfK2snzMRoQi4cGRvEfr4jGDsHX28Va9fVeTBlctq5LZOAzXvI8nnqnEb-iVWgObxOMOVyeXxI-lvI Solved example: pressure needed to compress water Let's solve a numerical on bulk modulus. Let's explore how easy or difficult it is to compress water in this problem-solving video. https://cdn.kastatic.org/ka-youtube-converted/xjMwgcoUyOo.mp4/xjMwgcoUyOo.mp4 360 Mechanical properties of solids https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-shear-and-bulk-stress/v/solved-example-percentage-change-in-density 2020-06-23T07:22:40Z Solved example: percentage change in density Let's explore how to figure out the percentage change in density of a material when it is subjected to bulk stress in this problem-solving video.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Solved example: percentage change in density Let's explore how to figure out the percentage change in density of a material when it is subjected to bulk stress in this problem-solving video.  https://cdn.kastatic.org/ka-youtube-converted/SydezoZRS3w.mp4/SydezoZRS3w.mp4 693 Mechanical properties of solids https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-shear-and-bulk-stress/e/elastic-moduli 2026-04-07T22:59:30.107127435Z Elastic moduli Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-optional-application-of-elastic-properties/v/why-use-i-beams-in-construction 2020-06-23T07:22:40Z Why use I beams in construction? When constructing buildings, why do we always use beams which have a cross-sectional shape of I? Let's explore this intuitively in this video. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/WHhp7EBIq2kzXBe9YsXIdMIc469xHBnfm0_QUZ-CLKohIUfSOx9Q6hZLQqYVzfkX88w6uic9gdiNBvUkkD1Oh6U Why use I beams in construction? When constructing buildings, why do we always use beams which have a cross-sectional shape of I? Let's explore this intuitively in this video. https://cdn.kastatic.org/ka-youtube-converted/JuyorN_1cIY.mp4/JuyorN_1cIY.mp4 451 Mechanical properties of solids https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-optional-application-of-elastic-properties/v/how-to-strengthen-concrete 2020-06-23T07:22:41Z How to strengthen concrete? Concrete is strong, but not strong enough to make roads out of them. In this video, we will explore how we can use the concepts of elasticity to improve the strength of concrete. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/LRvClIb65GFH_ANxl_Q3qBiVhzwGa4huT3heZO_gNISJtf1WF5w_Djci12nVUSq-wrec04Gaukhu405QP6-eeS65 How to strengthen concrete? Concrete is strong, but not strong enough to make roads out of them. In this video, we will explore how we can use the concepts of elasticity to improve the strength of concrete. https://cdn.kastatic.org/ka-youtube-converted/PpZlrsVGLxk.mp4/PpZlrsVGLxk.mp4 611 Mechanical properties of solids https://www.khanacademy.org/science/in-in-class11th-physics/in-in-mechanical-properties-of-solids/in-in-optional-application-of-elastic-properties/v/how-tall-can-mountains-get 2020-06-23T07:22:36Z How tall can mountains get? Is there is a limit to the height of a mountain? Let's see what the height of a mountain has got to do with elastic properties of a material. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/7je638pjuHvTukqOLlRroXg1Gr7oDv1FY5ASvIeqYGAZ_48is1sELARNSTVZFESk42mBx2YlD5UiLGW5SQ0810o How tall can mountains get? Is there is a limit to the height of a mountain? Let's see what the height of a mountain has got to do with elastic properties of a material. https://cdn.kastatic.org/ka-youtube-converted/vAHsyDpxyzU.mp4/vAHsyDpxyzU.mp4 490 Mechanical properties of solids