https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:forces/x0e04e0cb682fb793: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 Push and pull 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 Push and pull 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 Push and pull 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 Push and pull 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 Push and pull 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-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 Push and pull https://www.khanacademy.org/science/mh-grade-8-science/x0f256b8de9c7cf34:force-and-pressure/x0f256b8de9c7cf34:force/v/force-has-direction-and-magnitude 2023-07-03T13:44:16.33096147Z Force has direction and magnitude A force is made up of two things - direction and magnitude. Let's see how! Vibhor Pandey video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Force has direction and magnitude A force is made up of two things - direction and magnitude. Let's see how! https://cdn.kastatic.org/ka-youtube-converted/_F3WC9g2-x8.mp4/_F3WC9g2-x8.mp4 75 Push and pull https://www.khanacademy.org/computing/pixar/effects/particle-physics/v/fx8-fine 2023-07-31T16:40:28.830178554Z Understanding net forces When multiple forces are acting on a particle we need to express them as a single force known as a net force. To find the net force, add all forces using vector addition. Net force determines the direction of acceleration. video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Understanding net forces When multiple forces are acting on a particle we need to express them as a single force known as a net force. To find the net force, add all forces using vector addition. Net force determines the direction of acceleration. https://cdn.kastatic.org/ka-youtube-converted/ypX2FQVr0ag.mp4/ypX2FQVr0ag.mp4 120 Push and pull https://www.khanacademy.org/science/in-in-class11th-physics/in-in-class11th-physics-laws-of-motion/in-in-class-11-newtons-first-law-mass-and-inertia/e/newtons-first-law-exercises-ap1 2026-03-25T13:20:47.939559562Z Net force and acceleration exercise Practice using Newton's first law to make conclusions about an object's acceleration or the forces on the object.  April Russell exercise https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:kinematics/x0e04e0cb682fb793:acceleration/v/intro_to_acceleration 2024-06-21T18:55:31.273097146Z Acceleration Acceleration is the rate of change of velocity (a = Δv/Δt). The unit for acceleration is m/s/s, or m/s^2. Acceleration is a vector with magnitude and direction. If velocity and acceleration point the same direction, the object is speeding up. If velocity and acceleration point opposite directions, the object is slowing down. Changing direction is also a form of acceleration. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/5bcc5c04-58ec-4ae7-95a9-50abf4cbd4c0_1280_720_base.png Acceleration Acceleration is the rate of change of velocity (a = Δv/Δt). The unit for acceleration is m/s/s, or m/s^2. Acceleration is a vector with magnitude and direction. If velocity and acceleration point the same direction, the object is speeding up. If velocity and acceleration point opposite directions, the object is slowing down. Changing direction is also a form of acceleration. https://cdn.kastatic.org/ka-youtube-converted/JSPwCtIPfQw.mp4/JSPwCtIPfQw.mp4 620 Push and pull https://www.khanacademy.org/computing/pixar/effects/particle-physics/e/net-forces 2021-06-05T01:50:11Z Net forces Understand how to sum forces to find the net force on a particle Peter Collingridge exercise https://www.khanacademy.org/science/shs-physical-science/x0492729e402f0c6b:4th-quarter/x0492729e402f0c6b:universal-laws-of-physics/v/acceleration-in 2024-01-16T04:11:35.384208864Z Acceleration Let's explore what acceleration is and how we calculate it. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Acceleration Let's explore what acceleration is and how we calculate it. https://cdn.kastatic.org/ka-youtube-converted/TAtCs9ifRRY.mp4/TAtCs9ifRRY.mp4 516 Push and pull https://www.khanacademy.org/science/bmc-grade-7-science/x2dc8db125f483583:motion-force-and-work/x2dc8db125f483583:acceleration/e/basics-of-acceleration 2026-04-08T00:36:09.500768563Z Basics of acceleration Let's solve some questions vibhor exercise https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:kinematics/x0e04e0cb682fb793:acceleration/v/acceleration 2021-03-04T17:23:37Z Acceleration Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt. This allows you to measure how fast velocity changes in meters per second squared (m/s^2). Acceleration is also a vector quantity, so it includes both magnitude and direction. Sal Khan video https://cdn.kastatic.org/googleusercontent/vh_oD2kwoF5uq6cG19tdNL-a_Ssi3XOFXAtVjX6OTwuB72QxF3K6NkeawdQZtTXcfSMJk138fRZUM71ljnenqH0b Acceleration Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt. This allows you to measure how fast velocity changes in meters per second squared (m/s^2). Acceleration is also a vector quantity, so it includes both magnitude and direction. https://cdn.kastatic.org/ka-youtube-converted/FOkQszg1-j8.mp4/FOkQszg1-j8.mp4 546 Push and pull https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:motion-and-forces/x6679aa2c65c01e53:describing-motion/e/apply-accelerated-motion 2026-05-22T02:50:56.444203687Z Apply: Accelerated motion Apply your knowledge of accelerated motion in this set of free practice questions. Emily Cizmas exercise https://www.khanacademy.org/science/cambridge-o-level-physics-cie/x0e04e0cb682fb793:kinematics/x0e04e0cb682fb793:acceleration/a/acceleration-article 2025-03-07T16:50:49.734868403Z What is acceleration? Velocity describes how position changes; acceleration describes how velocity changes. Two layers of change! article