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What are Kinetic and Potential Energy?

What are Kinetic and Potential Energy?. What is ENERGY ?. Energy is the ability to do work. Everything that happens in the world uses energy ! Most of the time we can’t see energy , but it is everywhere around us!. Energy…. is NEVER created or destroyed!.

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What are Kinetic and Potential Energy?

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  1. What are Kineticand Potential Energy?

  2. What is ENERGY? • Energy is the ability to do work. • Everything that happens in the world uses energy! • Most of the time we can’t see energy, but it is everywhere around us!

  3. Energy… • is NEVER created or destroyed! • can only be STORED or TRANFERRED.

  4. This car uses a lot of energy Batteries store energy! Even this sleeping puppy is using stored energy. We get our energy from FOOD!

  5. How is all energy divided? All Energy PotentialEnergy Kinetic Energy

  6. PotentialEnergy is… • The energy stored in an object. • "Potential" simply means the energy has the ability to do something useful later on.

  7. Examples of PotentialEnergy: A stretched rubber band.. Water at the top of a waterfall.. Yo–Yo held in your hand.. A drawn Bow and Arrow…

  8. The higher an object, the more potential energy. • The more mass an object has, the more potentialenergy it has.

  9. Which object has more potentialenergy? • Why? B A

  10. ANSWER A This brick has more mass than the feather; therefore more potential energy!

  11. Changing an objects’ height can change its potentialenergy. • If I want to drop an apple from the top of one of these three things, where will be the most potentialenergy? • Why? A C B

  12. ANSWER • The higher the object, the more potentialenergy! A

  13. PotentialEnergy Converted to KineticEnergy… • When stored energy begins to move, the object now transfers from potentialenergy into kineticenergy.

  14. KineticEnergy Is… • The energy of a moving object. • "Kinetic" means movement! • When storedenergy is being used up, it is making things move or happen.

  15. Examples of KineticEnergy:

  16. The faster the object moves, the more kineticenergy is produced. • The greater the mass and speed of an object, the more kineticenergy there will be.

  17. When these objects move at the same speed, which will have more kineticenergy?

  18. ANSWER The semi- truck has more mass; therefore, more kineticenergy!

  19. An object has the MOST kinetic energy when it’s movement is the GREATEST. • When an object has the LEAST potentialenergy, it has the MOST kinetic energy.

  20. A water bottle is knocked off a desk.When does the bottle have the MOST kineticenergy? A. At the top of the fall. B. In the middle of the fall. C. At the bottom of the fall.

  21. C. At the bottom of the fall. • It has the most kinetic energy when its movement and speed are greatest, which is at the bottom of the fall right before it hits the ground. • When an object has the LEAST potential energy is when it has the MOST kinetic energy. BrainPop hollandms1 bulldogs

  22. Roller Coasters • When does the train on this roller coaster have the MOST potential energy? • AT THE VERY TOP! • The HIGHER the train is lifted by the motor, the MOREpotentialenergy is produced. • At the top of the hill the train has a huge amount of potentialenergy, but it has very little kineticenergy.

  23. As the train accelerates down the hill the potential energy is converted into kineticenergy. • There is very little potential energy at the bottom of the hill, but there is a great amount of kineticenergy.

  24. When does the train on this roller coaster have the MOST kinetic energy? (When is it moving the fastest?) (When does it have the LEAST potential energy???) • At the bottom of the tallest hill!

  25. Animated Roller Coaster

  26. #1 Potential Energy: High , because its at the top of hill. Kinetic Energy: Low, because car is not moving. • May use increasing and decreasing as part of high, medium and low.

  27. High, medium or low, increasing or decreasing #1 Potential Energy: high, because it’s the tallest hill of the roller coaster. Kinetic Energy: Low, because the train is not moving #2 Potential Energy: Kinetic Energy:

  28. Potential Energy – Stored Energy describes position • High up • Down low • Pulling more • Pulling less • Kinetic Energy – Movement Energy describes movement • Moving Fast • Moving Slow • Stopped

  29. Notes • All energy is divided into two types: potential and kinetic. • Potential Energy: The energy stored in an object. • Kinetic Energy: The energy of a moving object. • Energy is never created or destroyed. It is always stored or transferred.

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