MECHANICAL ENERGY. Energy cannot be transferred outside, IF in an isolated closed system. Since Potential Energy=U g =Mass x Gravity x Height, the bird's potential energy while sitting on

top of the tree is greater than it's potential energy would be standing on the ground. Say the mass of the bird is 10 kg and the height of the tree is 10 m. In the tree: Ug = Mgh = (10)(9.8)(10) =980 Joules On the ground: Ug = Mgh =(10)(9.8)(0) = 0 Joules Total Mechanical Energy= Mgh + 1/2mv 2 (Potential) (Kinetic) Mechanical Energy is the same at the top as the bottom.

If the mass of the box and height of the ramp are given and you want to find the speed (velocity), set the potential energy equal to the kinetic and solve. Mgh = 1/2mv. 2 Shortcut for velocity! Square root of 2gh 2 10 m/s 20 m 35 m 500 kg A B C D E The amount of total mechanical energy at points A, B, C, D, & E is the same. 60 m Mass of the cart: 500 kg

Height of point A: 60 m How will you find the speed of point D? Remember, the potential energy at point A is equal to the kinetic energy at point D.... so, you use Mgh = 1/2 mv. 2 Got an idea yet? An airplane nose dives from a height of 3000 m to 1800 m. To find the change in potential energy, you find the potential energy at its highest point and subtract the potential energy from the new height. Potential energy CAN be negative! Thanks for watching! By: Allison Johnson & don't forget the equation, Me= Ug + K! - olivewhite.com - course notes Source citations - Principles and Problems by: Holt

### Present Remotely

Send the link below via email or IM

CopyPresent to your audience

Start remote presentation- Invited audience members
**will follow you**as you navigate and present - People invited to a presentation
**do not need a Prezi account** - This link expires
**10 minutes**after you close the presentation - A maximum of
**30 users**can follow your presentation - Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

### Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.

You can change this under Settings & Account at any time.

# Total Mechanical Energy

By:Allison Johnson

by

Tweet