1 / 15

GPE

GPE. and how to calculate it. reminder mass and weight. Mass: how much substance in something , measured in Kgs (kilograms) Weight: the force acting on the mass of an object due to gravity, measured in N (newtons) . Reminder types of energy. types of potential energy. Chemical:

paulos
Download Presentation

GPE

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. GPE and how to calculate it

  2. reminder mass and weight Mass: how much substance in something , measured in Kgs (kilograms) Weight: the force acting on the mass of an object due to gravity, measured in N (newtons)

  3. Remindertypes of energy

  4. types of potential energy • Chemical: • possessed by foods, fuel and batteries • Elastic: • possessed by stretched springs, elastic and rubber bands • Gravitational: • possessed by anything which can fall

  5. what is gravitational potential energy ? • This is a type of energy possessed by anything that is a height above the ground, such as a roller coaster, a book you raise from the floor or an apple about to fall from a tree

  6. A simple example Height above ground So has potential energy No height above ground No potential energy Height

  7. What happens to the Gpe when something falls ? • Energy is conserved: the GPE that an object loses is converted to kinetic (movement) energy as an object falls. Don’t worry to much about this we’ll cover it in a future lesson

  8. How do we calculate GPE We can CALCULATE gpe BY USING A SIMPLE EQUATION: Potential Energy = weight X height But remember that: weight =mass x g so Potential Energy=mass X g X height

  9. Or in this form

  10. What are the letters in the equation? • P.E: potential energy, measured in joules (just like every other type of energy) • m: mass of the object measured in Kgs • g: Gravitational field strength on earth, a constant 10 N/kg • h: the height between the floor and the object

  11. A worked example • Tony hawk has a mass of 80kgs • He has a height above the ground of 2 meters • What is his GPE?

  12. Worked example part two Using P.E.=m X g X height P.E.=80x10x2 P.E.=1600J 2 m

  13. A question for you • Tony hawk has just jumped a vert ramp. He is 10 meters from the floor. His mass is 80 kg. What is his GPE?

  14. solution Weight =mass x g P.E=weight x height Mass =80kgs g=10N kgs height=10m P.E.= 80Kgs x 10N/kg X 10m P.E.=8000J

  15. Some further questions • A 1kg mass is raised 1m from the floor what is its GPE? • A ball has a mass of 0.5 Kgs. It is 15 meters high. What is its GPE? • A roller coaster has a GPE of 150000J at the top of its loop. Its mass is 1000kgs. What height is the top of the loop. • An paper aeroplane has a mass of 0.01kgs, it reaches a height of 4m. What is its GPE? • Remember that g= 10N/kg

More Related