https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-work-energy/in-in-work/v/work-done-on-liftingfalling-things-solved-numerical-work-energy-physics-khan-academy 2020-06-23T07:22:40Z Work done on lifting/falling things - Solved numerical Let's calculate 2 problems on work done on lifting & falling bodies.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/UVW_EGTFtDlKbXwrealu_SPgMjUtL1Edym8XbOs7H_za3gr8Hy4ZvJIPzaOW7u3xoyWh5DFvMKznMDYRKUYSSM7Q Work done on lifting/falling things - Solved numerical Let's calculate 2 problems on work done on lifting & falling bodies.  https://cdn.kastatic.org/ka-youtube-converted/lOC-RDGOM3s.mp4/lOC-RDGOM3s.mp4 595 Work & Energy https://www.khanacademy.org/science/in-in-class11th-physics/in-in-class11th-physics-work-energy-and-power/in-in-class11-introduction-to-work/e/work-equation-ap-physics-1 2025-02-17T09:21:56.366138887Z Calculating work done by a force Practice finding the work done by a force when given the force and displacement vectors for an object.  Sean Boston exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-work-energy/in-in-energy/v/kinetic-energy-derivation-work-energy-physics-khan-academy 2020-06-23T07:22:40Z Kinetic energy derivation Let's derive the K.E. expression 1/2 m v^2.   Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/74PtyEBmE6LMW5ZH6UKT1Wm3WWJvUhEFsukZXrqGJm0yuzxTtCEtQ4FuLg5AjjMgVV6eHh00LXpwbzb1zBZlM9o Kinetic energy derivation Let's derive the K.E. expression 1/2 m v^2.   https://cdn.kastatic.org/ka-youtube-converted/Kmr5w1j0neA.mp4/Kmr5w1j0neA.mp4 714 Work & Energy https://www.khanacademy.org/science/in-in-class11th-physics/in-in-class11th-physics-work-energy-and-power/in-in-class11-kinetic-energy-ap/e/kinetic-energy-exercises-ap1 2025-02-17T09:04:27.796626334Z Using the kinetic energy equation Practice using the equation for kinetic energy to find mass, velocity, and kinetic energy.  April Russell exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-work-energy/in-in-energy/v/gravitational-potential-energy-derivation-work-energy-physics-khan-academy 2020-06-23T07:22:42Z Gravitational potential energy derivation Let's derive expression for gravitational potential energy.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/P2qiltiVUzc3i3Ne1cvL7szFYmNjlGgr7Ts7ehpAv3kqvdMlC2PZeSKmqJtStob6K4UoTRQ4_SD2FYwOc4UMiHMl Gravitational potential energy derivation Let's derive expression for gravitational potential energy.  https://cdn.kastatic.org/ka-youtube-converted/BlQg-0WQk9k.mp4/BlQg-0WQk9k.mp4 506 Work & Energy https://www.khanacademy.org/science/ap-college-physics-1/xf557a762645cccc5:work-energy-and-power/xf557a762645cccc5:potential-energy/e/gravitational-potential-energy-ap-physics-1 2025-12-23T14:40:11.31866507Z Potential energy Check your understanding of potential energy in this set of free practice questions. Sean Boston exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-work-energy/in-in-work-energy-theorem/v/work-done-from-kinetic-energy-solved-example-work-energy-physics-khan-academy 2020-06-23T07:22:41Z Work done from kinetic energy - solved example Let's calculate work done when velocities are given.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/Lr4wjflZdpQNyvbGyyvP2VCqiBT9XsioGyVM9jZbt8kqTQ_YFeLxFq9z23rE2cIqE_11f3u9MYUaNIeThvoWUSyh Work done from kinetic energy - solved example Let's calculate work done when velocities are given.  https://cdn.kastatic.org/ka-youtube-converted/LexvE1LV0aE.mp4/LexvE1LV0aE.mp4 512 Work & Energy https://www.khanacademy.org/science/in-in-class11th-physics/in-in-class11th-physics-work-energy-and-power/in-in-class11-work-energy-theorem/e/work-energy-theorem-exercises-ap1 2026-03-25T13:20:47.939559562Z Calculating change in kinetic energy from a force Find the change in kinetic energy from a force using the work energy theorem. April Russell exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-work-energy/in-in-law-of-conservation-of-energy/v/energy-conservation-solved-example-work-energy-physics-khan-academy 2025-01-02T23:26:09.730705957Z Conservation of energy examples Practice two problems involving conservation of energy. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/eRpthabXUxS0tL90GF6SUI-79UtdZNvlmE00dcZkj35A8cBbA7qGy78B1soTnD1NMeZEEAXPfHzfiAE_YriEEKGU Conservation of energy examples Practice two problems involving conservation of energy. https://cdn.kastatic.org/ka-youtube-converted/O-9BXpHcOdQ.mp4/O-9BXpHcOdQ.mp4 575 Work & Energy https://www.khanacademy.org/science/in-in-class-11-physics-cbse-hindi/in-in-11-work-energy-and-power-hindi/conservation-of-energy-hindi/e/conservation-of-energy-conceptual-exercises-ap1 2026-04-08T00:36:09.500768563Z Changes in energy Practice applying the conservation of energy to predict changes in kinetic energy, potential energy, and velocity. April Russell exercise https://www.khanacademy.org/science/ap-college-physics-1/xf557a762645cccc5:work-energy-and-power/xf557a762645cccc5:untitled-271/e/conservation-of-energy-law-ap-physics-1 2025-12-21T23:40:11.622015733Z Conservation of energy Practice applying conservation of energy in this set of free practice questions. Sean Boston exercise https://www.khanacademy.org/science/in-in-class9th-physics-india/in-in-work-energy/in-in-power/v/power-work-energy-physics-khan-academy 2020-06-23T07:22:40Z Power Let's explore the meaning of power (rate of doing work) in physics.  David SantoPietro video https://cdn.kastatic.org/googleusercontent/14DowYKTOUJriOj1nfocq89GIng2pdsZhrXMZlyVbf07ocCVuHQ0LFZFhE2lK6h23LrrQdYhmRnherhUeqpZvz-S Power Let's explore the meaning of power (rate of doing work) in physics.  https://cdn.kastatic.org/ka-youtube-converted/u5OJ--Zk0FQ.mp4/u5OJ--Zk0FQ.mp4 169 Work & Energy https://www.khanacademy.org/science/ap-college-physics-1/xf557a762645cccc5:work-energy-and-power/xf557a762645cccc5:power/e/power-ap1 2026-03-10T01:30:45.544717502Z Power Practice applying the relationship between power and the rate of energy transfer.  April Russell exercise https://www.khanacademy.org/science/in-in-class10th-physics/in-in-electricity/in-in-commercial-unit-of-electrical-energy/v/solved-example-cost-of-operation-of-electrical-device 2020-06-23T07:22:40Z Solved example - Cost of operation of electrical device Let's calculate the cost of operating an electrical device for a specific duration.  Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/o3ebZOhWF4ogocMAUbY73-RXDyUN2YuYGe0aFGlgUutIcSLz5keoaVkys4MNriASDctvMNCvm74sRrTqoVatlps Solved example - Cost of operation of electrical device Let's calculate the cost of operating an electrical device for a specific duration.  https://cdn.kastatic.org/ka-youtube-converted/_A1ww8WQhu0.mp4/_A1ww8WQhu0.mp4 571 Work & Energy