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# 2.1 energy

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### 2.1 energy

1. 1. KINETIC AND POTENTIAL ENERGY BY: JESSA PAMONAG
2. 2.  Energy is the ability to do work.  All energy can be classified as either  __________ or____________ ◦ measured in Joules (J) ◦ 1 Joule = 1 Nm  Everything that happens in the world uses energy!  Most of the time we can’t see energy, but it is everywhere around us!
3. 3.  is NEVER created or destroyed!  can only be STORED or TRANSFERRED.
4. 4. Batteries store energy! This car uses a lot of energy We get our energy from FOOD! Even this sleeping puppy is using stored energy.
5. 5. Remember: ALL matter is made up of particles. The particles NEVER stop moving.
6. 6. All Energy Potential Energy Kinetic Energy
7. 7.  The energy stored in an object.  "Potential" simply means the energy has the ability to do something useful later on.  Potential energy exists whenever an object which has mass has a position within a force field.
8. 8. PE = mgh (Potential Energy = mass x gravity x height)
9. 9. Calculate the work done by a 50 – kg nurse in lifting 25 – kg child, 0.50 m on the table. both the child and her own weight. *Suppose her center of gravity also rises about 0.50 m.
10. 10.  The energy of a moving object.  "Kinetic" means movement!  When stored energy is being used up, it is making things move or happen.
11. 11. KE = ½mv² (Kinetic Energy = ½ (mass) (velocity)² www.makemegenius.com Free Science Videos for Kids
12. 12. How much energy is required to accelerate a 1000 – kg from rest to 30 m/sec, assuming no friction ? *Since the car is on level ground and frictions neglected, all of the energy used to accelerate the car goes into energy of motion. www.makemegenius.com Free Science Videos for Kids
13. 13. OTHER KINDS OF ENERGY..
14. 14. Kinetic Energy All Energy Potential Energy Gravitation Potential Energy Elastic Potential Energy Chemical Potential Energy
15. 15. o Potential energy due to an object’s position o P.E. = mass x height x gravity Don’t look down, Rover! Good boy!
16. 16. o Potential energy due compression or expansion of an elastic object. Notice the ball compressing and expanding
17. 17. o Potential energy stored within the chemical bonds of an object