Sequence wise lecture of ABJ sir class 11. Complete playlist of class 11 physics for Jee mains and advance . For another subject or class 12 playlist , Check on channel (if it's not there , check after few days).
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Watch Complete YouTube Lectures Distraction-Free Download the Competishun App 👉 https://play.google.com/store/apps/details?id=xyz.penpencil.competishun&pcampaignid=web_share 🌐 Login for Courses & Test Series: 👉 https://i.competishun.com/ *Popular Courses for IIT-JEE:* Pratham | Prakhar | Prakhar Integrated I | Praveen | Pragyaan C3 | Champ | CATS | ABC | PYQ Express UTS | ATS 👉 Explore all: https://competishun.com/courses/ 📞 Support: 8888-0000-21 | 7410-900-901 | 7410-900-908 --------------- Topics covered in this Chapter Centre of Mass Class 11 lecture by ABJ sir IITD with timestamp: 00:00 - 04:19 COM Problem 1: Based on the Motion of COM. In this problem, we have a semi-circular ring of mass M, and radius R. Speed of this ring is V. So we have to find the momentum of this half ring. 04:34 - 09:19 Linear Momentum Conservation Theorem: According to the conservation of linear momentum, If the net external force acting on a system of bodies is zero, then the momentum of the system remains constant. So Velocity of COM will remain Constant. ABJ Sir proves this Theorem and states the theorem. 09:46 - 20:28 COM Problem 2: Based on the COM of a system is Fixed. In this problem, we have a Planck of Mass M of length L on the smooth surface. At one end of the plank, a boy is standing, and he is moving from one end to another end of the Planck. Then you can find the displacement of the Planck in which the boy reaches the other end of the Planck. To solve this problem, ABJ Sir used the Law of conservation of linear momentum of a system. 20:41 - 31:31 COM Problem 3: Based on the COM of a system is Fixed. In this problem, we have a Water surface of non-viscous water, A boat of 100 kg and 10 m in length. Two boys of 80 kg and 20 kg of mass are at both ends of the boat. Initially, the complete system is at rest. Now they move and exchange their positions. So we have to find the displacement of the boat. To solve this problem, ABJ Sir used the Law of conservation of linear momentum of a system. 31:57 - 37:18 COM Problem 4: Based on the COM of a system is Fixed. In this problem, we have a Planck of Mass M of length L on the smooth surface. At one end of the plank, a boy is standing and he start running with velocity u wrt ground from one end to another end of the Planck. Then we have to find recoil velocity of the Planck. To solve this problem, ABJ Sir used the Law of conservation of linear momentum of a system. 37:35 - 41:15 COM Problem 5: Based on the COM of a system is Fixed. In this problem, we have a Planck of Mass M of length L on the smooth surface. At one end of the plank, a boy is standing and he start running with velocity u wrt Planck from one end to another end of the Planck. Then we have to find recoil velocity of the Planck. To solve this problem, ABJ Sir used the Law of conservation of linear momentum of a system 41:57 - 51:38 COM Problem 6: In this problem, we have two mass block of mass m and M connected with a spring of spring constant k with initial compression of X0 on a smooth surface. This system is at rest initially and now it is released. So we have to find the maximum velocity of the blocks. To solve this problem, ABJ Sir used the Law of conservation of linear momentum of a system 51:48 - 01:04:04 COM Problem 7: In this problem, we have a gravity free space and a explosive of 5 kg is at rest. After the explosion, if this explosive disintegrate into 4 parts in which 3 parts each of mass 1 kg are moving as shown then find the velocity of 4th part (2kg). To solve this problem, ABJ Sir used the Law of conservation of linear momentum of a system. Also Find minimum energy of explosion. 01:04:15 - 01:14:53 COM Problem 8: In this problem, we have a Planck of mass M (as shown) and a block of mass m is at height H on the Planck, this complete system is on the smooth surface. We have to find speed of blocks when m reaches ground. To solve this problem, ABJ Sir used the Law of conservation of linear momentum of a system. 01:15:32 - 01:25:28 COM Problem 9: In this problem, On a smooth surface, we have a block of mass M connected with a spring of spring constant k, initially at natural length. Another mass m is moving toward block M with velocity u. We have to find maximum Compression in the spring. To solve this problem, ABJ Sir used the Law of conservation of linear momentum of a system.