As we learned before, the calculation of how much force exerted to move an object a certain distance is measured in energy. Energy has a law that it must follow, and its a law that is rather tricky to recognize. Energy is always conserved no matter what the situation. Analogous to chemistry when dealing with chemical equations, whatever you put in must also come out energy-wise. If you slide a box along a table, you have potential energy in you that is being converted into kinetic energy from the box. An essential thing to remember with this concept is that some energy will be lost to physical elements such as heat. We call these elements work that is not conserved when writing out our work summation equations. And with that, we have completed another major category in mechanics, and can move on to the next onepower.
For a conservative force doing work on a closed system, the work done provides a change in the system’s kinetic energy, and is equal to the opposite of the change in potential energy. The sum of the initial kinetic and potential energies therefore equals the sum of the final kinetic and potential energies.
Non-conservative forces change the total mechanical energy of a system, but not the total energy of a system. Work done by a non-conservative force is typically converted to internal (thermal) energy.
Conservation of Energy
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.