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).
Curated by: Athera (178 videos)
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 - 12:42 COM Problem 1: Based on the Oblique Collision. In this problem, we have two bodies, A and B, of masses 1 kg and 2 kg, respectively. Body A is moving toward Body B with a velocity of 10 m/s, and Body B is at rest. After the collision, the motion of both bodies is represented in the diagram. We have to find the velocities of A and B after the collision. Also, could you possibly find out the value of the coefficient of restitution? To solve this problem, ABJ Sir uses Momentum Conservation Theorem. 13:12 - 39:36 COM Problem 2: Based on the Oblique Collision. In this problem, we have a horizontal smooth surface and a block of mass 2 kg (According to the diagram) is free to move on this surface. A ball of mass 1 kg moves toward this block with a velocity of 10m/s, and after the collision with this block, the ball changes its direction from horizontal to vertical upward. We have to find the velocity of both ball and block after the collision. Also, please look at the impulse b/w A & B and the coefficient of restitution. 41:15 - 51:13 Oblique Collision b/w Balls: Oblique collision occurs when one of the two bodies has a velocity at an angle with the line of collision. In the case of an oblique collision, the component of velocity perpendicular to the line of the collision remains unchanged. This can be regarded as a collision in two dimensions. 52:04 - 01:05:43 Variable Mass System: A variable-mass system is a collection of matter whose mass varies with time. It cannot be very clear to try to apply Newton's second law of motion directly to such a system. Instead, the time dependence of the mass m can be calculated by rearranging Newton's second law and adding a term to account for the momentum carried by mass entering or leaving the system. 01:06:07 - 01:14:29 Rocket Propulsion Without Gravity: (Important topic - Based on the Variable Mass System.) Rocket propulsion is defined as "The force that is used by the rocket to take off from the ground and into the atmosphere." The principle on which rocket propulsion works is based on Newton’s third law of motion. Here, the fuel is forcibly ejected from the exit such that an equal and opposite reaction occurs. 01:15:09 - 01:25:16 Rocket Propulsion With Gravity: (Important topic - Based on the Variable Mass System.) Rocket propulsion is defined as "The force that is used by the rocket to take off from the ground and into the atmosphere." The principle on which rocket propulsion works is based on Newton’s third law of motion. Here, the fuel is forcibly ejected from the exit such that an equal and opposite reaction occurs. In last case , we study the motion of rocket or Rocket Propulsion, when there is no gravity. Now we are solving the example when there is gravity and value of g is uniform.