Previously, we compared energy to momentum as both are very important topics in mechanics. We also stated how energy has a conservation law that it must follow. Momentum also has a conservation law that it obeys, but has some fine print. First, there are two types of collisions elastic and inelastic, where the laws of conservation of energy and momentum do hold. However, if both objects are moving, then the kinetic energy of both objects will only be conserved in an elastic collision, the rest of the kinetic energy is converted to other forms of energy. This is an important concept that you need to understand, as AP administrators are likely to test your knowledge of the nitty-gritty, like this little kinetic energy fact. With this, we have concluded the main linear mathematical topics in the mechanics course.
In an isolated system, where no external forces act, linear momentum is always conserved. In any closed system, the total linear momentum of the system remains constant. This is a direct outcome of Newton’s 3rd Law of Motion.
In the case of a collision or explosion, if you add up the individual momentum vectors of all the objects before the event, you’ll find that they are equal to the sum of the momentum vectors of the objects after the event.
Kinetic Energy is conserved in an elastic collision.
Momentum tables can be used to solve for unknown quantities in collisions.
Conservation of Linear Momentum
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
This book includes a comprehensive review of the key AP Physics C concepts and targeted strategies for acing every section of the exam. Additionally, the book includes two full length practice tests with full answer explanations.
The book offers a complete review of your AP course, strategies to give you the edge on test day, and plenty of practice with AP-style test questions. It includes 2 full length practice exams modeled on the real test, 3 separate plans to fit your study stle, review material updated to the most recent tests, and all the terms and concepts you need to know.