C7 heat as a form of energy

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Chapter 7 Heat - Science Form 1

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C7 heat as a form of energy

  1. 1. CHAPTER 7HEAT<br />7.1 HEAT AS A FORM OF ENERGY<br />
  2. 2.
  3. 3. CHAPTER 7 HEAT<br />
  4. 4. Heat is a form of ENERGY (can be used to do work)<br />Heat cause objects to become hot<br />Example :<br /> We feel hot under the sun<br /> We feel cold when the sun is not not shining<br />
  5. 5. SOURCES OF HEAT<br />1. Friction<br /> rubbing two hands together<br />2. Combustion /burning<br /> burning of candles<br /> Electricity<br /> rice cooker<br />
  6. 6. Energy from friction creates heat. For example when you rub your hands, sharpen a pencil, make a skid mark with your bike, or use the brakes on your car, friction generates heat<br />A thermal infrared image of a pencil after being sharpened (left) and of hot brakes in a car (right). Notice the hot tip of the pencil.<br />FRICTION<br />
  7. 7. A thermal infrared image of a hair dryer and a flourescent light bulb<br />ELECTRICITY<br />
  8. 8. When a substance is burned , heat is also released<br />Burning firewood<br />COMBUSTION/BURNING<br />
  9. 9. USES OF HEAT <br />IN DAILY LIFE<br /> Cooking<br /> Drying clothes<br /> Keep us warm<br /> Causes breeze (sea breeze & land breeze)<br /> Solar energy<br /> Preserving food<br />
  10. 10. HEAT<br />& TEMPERATURE<br />
  11. 11. Temperature – a measure of the degree of hotness of an object or substance<br />Unit for temperature <br />– degree Celsius / 0C<br />Temperature is not energy, but a measure of it. Heat is energy.<br />
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  13. 13. Figure 1 shows three beakers W, X, and Y containing different amount of water.<br /> Figure 1<br /> Which of the following shows the quantities of heat in ascending order?<br /> A W, X, Y <br /> B Y, X, W <br /> C X, W, Y<br /> D Y, W, X<br />
  14. 14. Figure 2 below shows an experiment on heat conduction through a piece of iron rod. <br /> Figure 2<br />Which of the following thumbtacks will fall first?<br /> A. PC. R B. QD. S<br />
  15. 15. HEAT ENERGY<br />A hot object has more heat<br />Sun – primary source of heat energy<br />A cold object has less heat<br />1<br />2<br />5<br />3<br />4<br />Heat vs Temperature<br />Other source of heat?<br />Friction<br /> rubbing two hands together<br />2. Combustion /burning<br /> burning of candles<br />Electricity<br /> rice cooker<br />Uses <br />Cooking<br />Drying clothes<br />Keep us warm<br />Causes breeze<br />5. Solar energy<br />

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