Natural Sciences and Technology Grade 5-B ... - Thunderbolt Kids
Natural Sciences and Technology Grade 5-B ... - Thunderbolt Kids Natural Sciences and Technology Grade 5-B ... - Thunderbolt Kids
QUESTIONS: 1. Which fuel contained the most amount of energy and how did you determine this? The fuel containing the most amount of energy would have burnt for the longest and therefore caused the greatest change in the temperature of the water. 2. Where did the energy in the peanut originally come from? The energy comes from the Sun. 3. Discuss what happened to the energy stored in the nut, or other fuels you used. As the nut was set on fire, the stored energy was released as heat and light 4. What was the input energy needed to make the peanut (and other fuels) burn? Heat energy 5. What was the output energy obtained from the fuel? Heat and light energy 6. Discuss how you could compare the amount of energy stored in peanuts to the amount of energy stored in acashew nut. The experiment (peanut or cashew nut) that produces the biggest increase in temperature has used the fuel with the most stored energy. Repeat the experiment with apeanut and then acashew nut of the same mass. Learners can go into the details of how to set up and perform the experiment. Unless they have done it, they won't be able to predict which one has the most stored energy, but the following conclusion could be made: In order to light the fuel, you had to put in asmall amount of energy. The fuel however gave out alot more energy than what was put in. The dierence between the energy you put in and the energy the fuel gave out is how much energy was stored in the fuel. The OUTPUT ENERGY obtained from a fuel is GREATER THAN the INPUT ENERGY needed to make the fuel burn. 1.2 Burning fuels We have learnt that burning fuels provides us with energy that we can use. What does afuel need to be able to burn? 16 Energy and Change
Burning fuel requires some energy to start burning. Fuel needs oxygen to burn. Fuel usually gets oxygen from the air around it. There are other gases present in air as well, but they do not burn. The following pie chart illustrates how much of each type of gas is found in the air around us. Pie chart showing the percentage of gases in the air around us. QUESTIONS 1. How much of the air around us consists of oxygen? Oxygen makes up 21% of the air around us When something burns we say it is combusting. So, another word for burning is combustion. So, what happens to a flame when we take one of these things away, such as oxygen? When we take something away, we say we deprive it. Let's find out what happens when aflame is deprived of oxygen! Chapter 1. Stored energy in fuels VISIT The science of fireworks (video). goo.gl/d4HJj 17
- Page 1 and 2: Natural Sciences and Technology Gra
- Page 3 and 4: AUTHORS LIST This book was written
- Page 5 and 6: THE NATURAL SCIENCES AND TECHNOLOGY
- Page 7: Matter and Materials and Structures
- Page 12 and 13: 1 Stored energy in fuels 4 KEY QUES
- Page 14 and 15: VISIT How fossil fuels are made. go
- Page 16 and 17: So we can say that food is the fuel
- Page 18 and 19: MATERIALS: • various packaging fo
- Page 20 and 21: Coal is not only burnt in our homes
- Page 22 and 23: 2. Remove both ends of the large ca
- Page 26 and 27: INVESTIGATION: What happens when af
- Page 28 and 29: VISIT Burning substances in air and
- Page 30 and 31: 3. Write a description next to each
- Page 32 and 33: 3. What causes of fire can you iden
- Page 34 and 35: 3. Some points to think about when
- Page 36 and 37: 1. Describe the relationship betwee
- Page 38 and 39: 2 Energy and electricity 30 KEY QUE
- Page 40 and 41: When the electrical energy is trans
- Page 42 and 43: A car needs energy to start its eng
- Page 44 and 45: Huge pylons carrying the transmissi
- Page 46 and 47: ACTIVITY: 10 Safety tips for electr
- Page 48 and 49: KEY CONCEPTS Never stick a metal kn
- Page 50 and 51: 3 Energy and movement 42 KEY QUESTI
- Page 52 and 53: 2. Tie another elastic band around
- Page 54 and 55: QUESTIONS Look up adefinition for p
- Page 56 and 57: 5. Place it in the water, and let i
- Page 58 and 59: QUESTIONS Use your knowledge of spr
- Page 60 and 61: 4 Systems for moving things 52 KEY
- Page 62 and 63: Teacher's Note You can demonstrate
- Page 64 and 65: QUESTIONS Label the two wheels and
- Page 66 and 67: 4. Place a few marbles or some othe
- Page 68 and 69: 6. Repeat this for the other 2wheel
- Page 70 and 71: The board makes bearings for the ax
- Page 72 and 73: INSTRUCTIONS: Things you can use fo
Burning fuel requires some energy to start burning. Fuel needs<br />
oxygen to burn. Fuel usually gets oxygen from the air around it.<br />
There are other gases present in air as well, but they do not burn.<br />
The following pie chart illustrates how much of each type of gas is<br />
found in the air around us.<br />
Pie chart showing the percentage of gases in the air<br />
around us.<br />
QUESTIONS<br />
1. How much of the air around us consists of oxygen?<br />
Oxygen makes up 21% of the air around us<br />
When something burns we say it is combusting. So, another word<br />
for burning is combustion.<br />
So, what happens to a flame when we take one of these things<br />
away, such as oxygen? When we take something away, we say we<br />
deprive it. Let's find out what happens when aflame is deprived of<br />
oxygen!<br />
Chapter 1. Stored energy in fuels<br />
VISIT<br />
The science of<br />
fireworks (video).<br />
goo.gl/d4HJj<br />
17
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