1 / 9

Understanding Energy Transformations and Conservation in Roller Coasters

This section explores the concepts of potential energy (PE) and kinetic energy (KE) in roller coasters, illustrating the conservation of energy principle. At the top of a hill, potential energy is maximized while kinetic energy is at zero. As the coaster descends, all the potential energy converts to kinetic energy. The fundamental law of conservation of energy states that energy cannot be created or destroyed, only transformed. We also discuss the efficiency of machines, highlighting energy loss due to sound, friction, and air resistance, impacting useful work output.

annis
Télécharger la présentation

Understanding Energy Transformations and Conservation in Roller Coasters

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Section 4 Conservation of Energy

  2. I. Energy Transformations At the top of the hill, PE is at it’s maximum. What about KE? KE = 0.0 J PE = mgh PE = (515 kg)(9.8 m/s2)(70.0 m) PE = 353,290 J

  3. I. Energy Transformations At the bottom of the hill, KE is at it’s maximum. What about PE? PE = 0.0 J KE = ½mv2 KE = ½(515 kg)(37.1)2 All of the PE was converted to KE. KE = 353,290 J

  4. As the car reaches the top of the 2nd hill, KE = PE. KE = ½mv2 KE = ½(515 kg)(26.2)2 PE = mgh PE = (515 kg)(9.8 m/s2)(35.0 m) KE = 176,758 J PE = 176,645 J

  5. II. The Law of Conservation of Energy Energy cannot be created or destroyed. 1. Energy changes from one form to another Roller coasters lose energy through: Sound Friction Air Resistance

  6. III. Efficiency of Machines Not all work done by a machine is useful 1. Work Input is not equal to Work Output Energy is lost through: Sound Friction Air Resistance

  7. Example: With this pulley system, we should be able to lift 100 pounds with only 25 pounds of force. However, friction and heat would cause some of the input force (25 lbs.) to be lost.

  8. B. Efficiency Equation

  9. Sample problems pg. 407 Questions 1 – 3

More Related