- Created by: Zedridella
- Created on: 07-11-19 18:28
Energy can be defined as the ability to do work. It exists in many forms and can be changed from one form to another.Here are some examples:
- Nuclear Energy
- Elastic Energy
- Sound Energy
- Light Energy
- Gravitationl Potential Energy
- Kinetic Energy
Laws of Conversion energy
All energy transfers follow the law of conversion of energy.
Energy Cannot be created or destroyed just changed in form.
- This means that energy never just "disapears"
- The total amount of energy always stays the same.
i.e. Total Energy Input= Total Energy Output
- Energy that is transfered to unwanted forms of energy is wasted.
When energy is transfered work is done.
Work Done = Energy Transfered
Work Done = Force x Distance moved in direnction of force or W=FS
Force(f) is measured in newtons (N)
Distance, S is measured in metres (m)
Work done , w is measured in Joules (J)
Gravitational Potential Energy
Gravitational Potential Energy is the amount of energy an object has because of its position in a gravitational field.
GPE= mass x gravitational field strength x height
Gravitational field strength is 9.8 on earth
An Osprey with a mass of 2kg flies at a height of 200m above the ground. How much Gravitational Potential Energy does the Osprey have?
GPE=mass x gravitational field strength x height
= 2 x 9.8 x 200
Elastic Potential Energy
When a forcce acts to compress or stretch an object, that force does work
Elastic Potential Energy = 1/2 x spring constant x (extension)2