https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-gravity/in-in-universal-law-of-gravity/v/universal-law-of-gravity-example 2020-06-23T07:22:42Z Universal law of gravity example Let's explore how the force between masses change when the distances and the masses change using the universal law of gravity. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/WUqLpCr5cyDUkZBAwf_nHSrTVpWvPfoeRSsJKLZsFvbMTh-mmi_GJGmU9LZGUNSFtsyVkVGXBoHRxSQyI24mdTor Universal law of gravity example Let's explore how the force between masses change when the distances and the masses change using the universal law of gravity. https://cdn.kastatic.org/ka-youtube-converted/qyqamIpB6dE.mp4/qyqamIpB6dE.mp4 691 Gravity https://www.khanacademy.org/science/bridge-course-class-11th-physics/x4c0d503cda725c32:gravitation/x4c0d503cda725c32:universal-law-of-gravitation/e/universal-law-of-gravitation 2026-04-07T09:22:30.618598699Z Universal law of gravitation Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/bridge-course-class-11th-physics/x4c0d503cda725c32:gravitation/x4c0d503cda725c32:buoyancy/e/mass-and-weight 2026-03-25T13:20:47.939559562Z Mass and Weight Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-gravity/in-in-motion-of-objects-in-the-influence-of-gravitational-force-of-earth/v/free-fall-total-time-up-down-solved-example-gravity-physics-khan-academy 2020-06-23T07:22:40Z Free fall - total time up & down solved example Let's solve problems involving objects in free fall, and we are given/asked the total time to up and then come back down. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/pkJl6ln0koQjtdYPO6njQ8sqLCDmB8aT03m9eIs0VWesrx8zubxUO2EJm28r610INjSCTvjH8r-QeSqiMgJFdpF_ Free fall - total time up & down solved example Let's solve problems involving objects in free fall, and we are given/asked the total time to up and then come back down. https://cdn.kastatic.org/ka-youtube-converted/9WWEOP97JpI.mp4/9WWEOP97JpI.mp4 615 Gravity https://www.khanacademy.org/science/ap-college-physics-1/xf557a762645cccc5:kinematics/xf557a762645cccc5:mathematical-models-of-motion/e/freefall-exercises-ap1-numerical 2025-11-10T17:40:46.606305245Z Free fall calculations Practice calculating velocity, displacement, and time from word problems when an object is in freefall. April Russell exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-gravity/in-in-thrust-pressure/v/pressure-thrust-gravity-physics-khan-academy 2020-06-23T07:22:42Z Pressure & thrust What are thrust and pressure? Well, that's exactly what we will explore in this video. We will also learn the formula and units of pressure, by taking various examples. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/Z0MX0EzYefoZvVCAeqI43IF-Bm_SvDxX1iV3pBBPAOm6uI1RSLTlTg6PCwHN1S-Iuqr2VOW4htDw81tPqhjcjUJ3ow Pressure & thrust What are thrust and pressure? Well, that's exactly what we will explore in this video. We will also learn the formula and units of pressure, by taking various examples. https://cdn.kastatic.org/ka-youtube-converted/hAIYoWrXemY.mp4/hAIYoWrXemY.mp4 617 Gravity https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-gravity/in-in-thrust-pressure/v/calculating-pressure-due-to-weight-gravity-physics-khan-academy 2020-06-23T07:22:41Z Calculating pressure due to weight Let us calculate pressure due to the weight of a gorilla and monkey. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/uuuWdlmWaVLo08uOSi5L_2Nmh-Y1QKZe4hyzvdkQuxqqSJRueLA4g-gnlNzCSVUeVihWbxMbgt8Z0Wo_HKQ2hUBF Calculating pressure due to weight Let us calculate pressure due to the weight of a gorilla and monkey. https://cdn.kastatic.org/ka-youtube-converted/MMc9UPI2aLM.mp4/MMc9UPI2aLM.mp4 567 Gravity https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-gravity/in-in-pressure-in-liquids-archimedes-principle/v/archimedes-principle-buoyancy-fluids-physics-khan-academy 2020-06-23T07:22:41Z Archimedes principle & buoyancy Let's explore what Archimedes principle & buoyant force is. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/673yqc6SsuCJSAK_hOLRfO5zd9rjEcj_apBe0ajwcJruIx_PKh8Lf9kF2WB_2ckYijW3H5lcwLuR4KmRG7bSRNY Archimedes principle & buoyancy Let's explore what Archimedes principle & buoyant force is. https://cdn.kastatic.org/ka-youtube-converted/VRXLvJPTV0k.mp4/VRXLvJPTV0k.mp4 863 Gravity https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-gravity/in-in-pressure-in-liquids-archimedes-principle/e/thrust-and-pressure 2026-04-07T09:22:30.618598699Z Pressure and Buoyancy Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-gravity/in-in-pressure-in-liquids-archimedes-principle/e/archimedes-principle 2026-03-25T13:20:47.939559562Z Archimedes principle Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-gravity/in-in-density-and-condition-for-floating/v/condition-for-floating-fluids-physics-khan-academy 2020-06-23T07:22:41Z Condition for floating Let's learn why floatation depends on density. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/Y8JJZZN9grf265HT5dMD2dfrpGY6R9RqcgCnlzY1YUaX52993hQgD53g_oT397tdlgk379ra-FfTzd9YWHLF05N2og Condition for floating Let's learn why floatation depends on density. https://cdn.kastatic.org/ka-youtube-converted/eSc6N4zj3Zk.mp4/eSc6N4zj3Zk.mp4 673 Gravity https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-gravity/in-in-density-and-condition-for-floating/v/find-mass-of-displaced-liquid-solved-example-fluids-physics-khan-academy 2020-06-23T07:22:42Z Calculating mass of displaced liquid Let's solve 2 problems in finding the mass of displaced water.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/LMLqQ3kExM8xgWNjd-2LeoodqwSwMfhzemd-enXGVP4mr1i0uK6q5HP4XnVM8rdhupW17ZzRskSpaiowH5ribgU Calculating mass of displaced liquid Let's solve 2 problems in finding the mass of displaced water.  https://cdn.kastatic.org/ka-youtube-converted/3mWV4hrE8H8.mp4/3mWV4hrE8H8.mp4 865 Gravity https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-gravity/in-in-density-and-condition-for-floating/e/predict-if-an-object-floats-or-sinks 2026-04-07T09:22:30.618598699Z Condition of floating Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/ncert-class-9-science/x7e8d66f732d28ce4:in-in-gravity/x7e8d66f732d28ce4:in-in-relative-density/v/relative-density-specific-gravity 2025-05-29T08:44:44.739717086Z Relative density (Specific gravity) Let's explore what relative density is. Dubverse video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Relative density (Specific gravity) Let's explore what relative density is. https://cdn.kastatic.org/ka-youtube-converted/BgMT2EpMDME.mp4/BgMT2EpMDME.mp4 199 Gravity