6th Grade Chapter 12-energy


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6th Grade Chapter 12-energy

  1. 1. Energy Chapter 12
  2. 2. Energy <ul><li>Energy is the ability to cause change. It could change temperature, speed, position, shape or direction of an object. </li></ul><ul><li>There are many different types of energy. There is heat energy in the form of light. </li></ul><ul><li>There is chemical energy in the form of food. There is mechanical energy when you drive your car. </li></ul><ul><li>When you use energy to change things, the energy used often changes as well. An example is when the chemical energy in fireworks turn into light and heat energy. </li></ul>
  3. 3. Energy <ul><li>Whenever energy changes its called an energy transformation. </li></ul><ul><li>This occurs in your bodies also. When you eat pasta or a big Mac you are eating chemical energy. </li></ul><ul><li>When your muscles contract you use the chemical energy and turn it into heat energy so that you can play and run around. </li></ul><ul><li>That is why you get warm when you play and eventually sweat. </li></ul>
  4. 4. Energy <ul><li>Fats are a macromolecule that contain the most energy. They contain 3x more energy than sugars. </li></ul><ul><li>Our bodies do not use fats our first source of energy though because they are hard to break down. </li></ul><ul><li>We use sugars and carbohydrates first because they breakdown much easier. </li></ul>
  5. 5. Potential & Kinetic Energy <ul><li>These two energy types deal with motion. </li></ul><ul><li>Kinetic energy is the energy of motion. An object which has motion - whether it be vertical or horizontal motion - has kinetic energy. </li></ul><ul><li>Everything that moves has a different amount of kinetic energy, and it all depends on the mass and speed of the object. </li></ul><ul><li>What would have more kinetic energy, a car going 5mph, or a lion running at 5mph? </li></ul><ul><li>The car, b/c it has a lot more mass then a lion. </li></ul>
  6. 6. Potential & Kinetic Energy <ul><li>Potential Energy- is considered to be stored energy in an object. When a boulder is held at the top of the hill but is not moving it has potential energy. </li></ul><ul><li>Its has potential to roll down the hill at a certain speed. Once the rock does roll down the hill, the potential energy transforms into kinetic energy. </li></ul><ul><li>Potential energy goes to kinetic energy when something acts to release the stored energy. </li></ul><ul><li>The more potential energy something has the more kinetic energy it will have. </li></ul>
  7. 7. Potential & Kinetic Energy <ul><li>A good example is a pendulum on a clock. If you pull the pendulum and hold it you are creating potential energy. </li></ul><ul><li>When you let go, the pendulum swings and turns the potential energy into kinetic energy. </li></ul><ul><li>The farther back you pull the pendulum the more kinetic energy will be made when you release it to swing. </li></ul>
  8. 8. Kinetic Energy <ul><li>Kinetic energy can be transferred from one object to another, when objects interact with each other. </li></ul><ul><li>An example is when you throw a bowling ball toward the pins. When the ball interacts the pins, the move and the energy from the ball is transferred to the pins. </li></ul><ul><li>When the ball gives some of its kinetic energy to the pins the ball actually looses energy, and slows down. </li></ul><ul><li>H.W. pg 327 ques 1-4 </li></ul>
  9. 9. Thermal Energy <ul><li>Thermal energy deals with the transfer of heat energy. </li></ul><ul><li>When you go out in the cold and than have a cup of hot cocoa the cocoa warms you up because of its high thermal energy. </li></ul><ul><li>Thermal energy moves from objects that are warmer to ones that are cooler. </li></ul><ul><li>The thermal energy that moves from the warmer object to the cooler one is what we call heat. </li></ul>
  10. 10. Thermal Energy <ul><li>We base our temperatures on thermal energy. Normal body temp is 98.6 C, if you were sick it might be 102 C. </li></ul><ul><li>This means that the molecules in your body are causing more thermal energy than normal. </li></ul><ul><li>We measure temperature with thermometers and we have 2 different scales: Fahrenheit and Celsius. </li></ul>
  11. 11. Fahrenheit and Celsius <ul><li>Celsius is the metric systems way of calculating temperature. It is based upon the temperature characteristics of water. </li></ul><ul><li>This scale calls the freezing point of 0 o C and its boiling point is called 100 o C. </li></ul><ul><li>Fahrenheit is also known as the British measurement of temperature. It has water freezing at 32 o F and boiling at 212 o F. </li></ul>
  12. 12. How Thermal energy moves <ul><li>When you bake a cake the thermal energy of your oven moves and heats up the kitchen. Thermal energy moves in thre ways. </li></ul><ul><li>Radiation- this is thermal energy that moves away from its source in all directions in the forms of waves. Ex: The suns energy and a microwave oven uses radiation to heat things with thermal energy. </li></ul>
  13. 13. How Thermal energy moves <ul><li>Conduction- is the transfer of thermal energy from one molecule to another. </li></ul><ul><li>If you put a spoon into a hot bowl of soup, the spoon will get warmer because it conducts heat from the hot soup. </li></ul><ul><li>Convection- is the transfer of thermal energy from one place to another in a gas or liquid form. An ex: is the wind. Wind can move radiation energy from the sun across a body of water and cause the water to be heated. </li></ul><ul><li>H.W. pg 342 ques. 1-10 </li></ul>
  14. 14. Test in 1 Week!!!!!!!