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Bellringer

Bellringer. What biome has few trees and lots of grasses with a long dry season and a short wet season? What do we call the variable that we measure in an experiment? What phase of the moon does a lunar eclipse occur? What type of tide occurs during 1 st and 3 rd quarter moons?.

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Bellringer

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  1. Bellringer • What biome has few trees and lots of grasses with a long dry season and a short wet season? • What do we call the variable that we measure in an experiment? • What phase of the moon does a lunar eclipse occur? • What type of tide occurs during 1st and 3rd quarter moons?

  2. What are Kinetic and Potential Energy?

  3. What is Energy? • Energy is the ability to do work. • Work is done when a force causes an object to move in the direction of the force. • Everything that happens in the world uses energy! • Most of the time we can’t see energy, but it is everywhere around us!

  4. Energy… • is NEVER created or destroyed! • can only be STORED or TRANSFERED.- Law of Conservation of Energy

  5. How do energy and work help you play tennis? • The tennis player in does work on her racket by exerting a force on it. • The racket does work on the ball, and the ball does work on the net. • When one object does work on another, energy is transferred from the first object to the second object. • This energy allows the second object to do work. So, work is a transfer of energy. • Like work, energy is expressed in units of joules (J).

  6. How is all energy divided? All Energy Potential Energy Kinetic Energy

  7. Kinetic Energy • In tennis, energy is transferred from the racket to the ball. As it flies over the net, the ball has kinetic energy. • Kinetic energy is the energy of motion. • All moving objects have kinetic energy. • Like all forms of energy, kinetic energy can be used to do work. For example, kinetic energy allows a hammer to do work on a nail.

  8. Examples of Kinetic Energy:

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

  10. When these objects move at the same speed, which will have more kinetic energy?

  11. ANSWER The semi- truck has more mass; therefore, more kinetic energy!

  12. Bellringer • What biome has trees with leaves that have a waxy coating and cool temperatures? • What organisms get their energy from the sun? • What phase of the moon comes after waxing crescent? • What eclipse occurs during a new moon?

  13. Potential Energy • Is the energy an object has because of its position. • Example: • The bow has energy because work has been done to change its shape.

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

  15. Example of Potential Energy

  16. Elastic Potential Energy • Energy can be stored in bowstrings, springs, and rubber bands. • You change the shape of these objects by stretching them.

  17. Gravitational Potential Energy • When an object is lifted off the Earth’s surface. • You use a force that is against the force of gravity. • Books on a shelf have gravitational potential energy.

  18. Chemical Potential Energy • Potential energy stored in chemical bonds. • Before you eat that sugary drink or food, it has the potential to give you energy. • Food and drinks have chemical potential energy due to their chemical composition.

  19. Chemical Potential Energy • Batteries, gasoline, matches, and fireworks also have chemical potential energy.

  20. Practicing with whiteboards

  21. Potential or Kinetic? An apple on a tree.

  22. Potential or Kinetic? A rolling ball.

  23. Potential or Kinetic? A stretched rubber band.

  24. Gravitational, Elastic, or Chemical? Our food and drink.

  25. Gravitational, Elastic, or Chemical? A book on a shelf.

  26. Gravitational, Elastic, or Chemical? A stretched rubber band.

  27. Which object has more potential energy? B A

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

  29. Which one has more Kinetic energy? If Ms. Russell rolled a bowling ball and a soccer ball down the aisle at the same speed, which one would have more kinetic energy?

  30. Which one has more Kinetic Energy? A red tennis ball rolling slow or a blue tennis ball rolling fast?

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