join the ap-physics-1 course

๐ŸŽ–๏ธfiveable certificate upon completion

ap physics 1 study guides

๐Ÿงย  Multiple Choice Questions (MCQs)

4.3 Conservation of Energy, the Work-Energy Principle, and Power

#conservationofenergy

#energy

#work

#conservation

โฑ๏ธย ย 1 min read

written by

Peter Apps

peter apps

June 8, 2020


Enduring Understanding 5.B ๐Ÿ‘จโ€๐Ÿ’ป

The energy of a system is conserved.

When a system has no work being done on or by it, the total energy of the system is constant. This total energy can be internally converted among potential, kinetic, or thermal but never changes. This idea is the Law of Conservation of Energy and is one of the 4 major conservation laws in AP 1.

A key idea here is that this law only applies when there are no outside forces acting on the system. So a system consisting of a ball and the earth would have its energy conserved as the ball falls, but a system of a car would have its energy change as friction between the tires and the road removes kinetic energy.

Common situations where youโ€™ll be asked to apply energy conservation include: falling objects, sliding or rolling down ramps, masses & springs, and planetary orbits.

To help visualize this conservation, watch the roller coaster below (no friction).

https://firebasestorage.googleapis.com/v0/b/fiveable-92889.appspot.com/o/images%2Fce.gif?alt=media&token=1b3dc7a2-bafe-4a59-9b7c-cead1f2e4fc3

Image courtesy of PhysicsClassroom.

In this case, the TME is the total mechanical energy, or potential plus kinetic energies. Most of the time, when a question refers to the total energy, we really mean total mechanical energy.

๐ŸŽฅWatch: AP Physics 1 - Unit 4 Streams

Fiveable Logo

2550 north lake drive
suite 2
milwaukee, wi 53211

92% of Fiveable students earned a 3 or higher on their 2020 AP Exams.

*apยฎ and advanced placementยฎ are registered trademarks of the college board, which was not involved in the production of, and does not endorse, this product.

ยฉ fiveable 2020 | all rights reserved.