1 / 11

Mechanical Energy

Mechanical Energy. Energy is the ability to do work The unit for energy is the Joule(J). Work is related to energy. The energy of motion is called kinetic energy. KE = ½ mv 2. A 20 kg object is moving at 5 m/s. What is its kinetic energy?. 250 J. Stored energy is called potential energy.

samantha-koch
Download Presentation

Mechanical Energy

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. Mechanical Energy Energy is the ability to do work The unit for energy is the Joule(J). Work is related to energy.

  2. The energy of motion is called kinetic energy. KE = ½ mv2 A 20 kg object is moving at 5 m/s. What is its kinetic energy? 250 J

  3. Stored energy is called potential energy. We will deal with gravitational potential energy. That is energy an object has because of it’s position.

  4. PE = mgh mg is the weight and h is the height off the ground A 25 kg mass is held 10 m above the ground. What is its potential energy? 2450 J

  5. What is energy? Give an example of work. Where did the energy come from to do that work?

  6. Law of Conservation of Energy Energy may not be created or destroyed. Energy may be transformed from one form to another.

  7. A 20 kg snowboarder at rest is at a height of 15 m. What is their potential energy? 2,940 J What is their kinetic energy? 0 J What is their total energy? 2,940 J

  8. Assume you are still dealing with the same snowboarder. And that they are now 10 m above the ground. a) What is their potential energy? b) What is their total energy? c) What is their kinetic energy? d) What is their speed?

  9. a) 1960 J b) 2940 J c) 980 J d) 9.90 m/s

  10. When the same snowboarder has reached the ground, a)what is their potential energy? b)What is their total energy? c)What is their kinetic energy? d)What is their speed?

  11. a) 0 J b) 2940 J c) 2940 J d) 17.15 m/s

More Related