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
3 Energy and movement 42 KEY QUESTIONS • How can stored energy be changed into movement energy? • How can we make things move using stored energy? Teacher's Note This chapter is an introduction to stored (potential) energy and movement (kinetic energy). Although the proper terms are not used here, you could introduce them in class so that learners start to become familiar with these words for the later grades. Do you remember in Grade 4 when we looked at energy and movement in asystem? We were mostly looking at musical instruments and how they use movement energy (the input) such as plucking or blowing, to make them work. In this chapter we are going to look at some other ways of using stored energy to produce movement energy. 3.1 Elastics and springs Stretching an elastic band.
QUESTIONS Have you ever stretched an elastic band? When you pull it apart and then release it what happens? When you release the elastic band, it shoots back into position. Wow, I wonder how far I could shoot this elastic! When we stretch an elastic band, we store energy in it. This is because when the band is stretched it can do work when you release it. We are going to look at some other ways of using stretched elastic bands to do work and produce movement. ACTIVITY: Making your own catapult MATERIALS: • 10 ice lolly sticks or craft sticks • 4 to 6 rubber bands • 1 plastic spoon • Bag of marshmallows INSTRUCTIONS: 1. Place 8 of the sticks together and tie arubber band tightly around one end. Chapter 3. Energy and movement 43
- 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 24 and 25: QUESTIONS: 1. Which fuel contained
- 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 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
- Page 74 and 75: REVISION: 1. List four dierent vehi
- Page 78 and 79: 1 Planet Earth 70 KEY QUESTIONS •
- Page 80 and 81: • The Earth spins right around in
- Page 82 and 83: 3. Was it daytime in Saudi Arabia?
- Page 84 and 85: VISIT Short video showing the sun,
- Page 86 and 87: The planets move in orbits around t
- Page 88 and 89: MATERIALS: • 100m heavy string
- Page 90 and 91: Teacher's Note Make sure to point o
- Page 92 and 93: 2 Surface of the Earth 84 KEY QUEST
- Page 94 and 95: QUESTIONS: 1. What is under the flo
- Page 96 and 97: Imagine we could cut aslice out of
- Page 98 and 99: QUESTIONS 1. If you dig ahole in th
QUESTIONS<br />
Have you ever stretched an elastic b<strong>and</strong>? When you pull it<br />
apart <strong>and</strong> then release it what happens?<br />
When you release the elastic b<strong>and</strong>, it shoots back into position.<br />
Wow, I wonder how far I could shoot this elastic!<br />
When we stretch an elastic b<strong>and</strong>, we store energy in it. This is<br />
because when the b<strong>and</strong> is stretched it can do work when you<br />
release it. We are going to look at some other ways of using<br />
stretched elastic b<strong>and</strong>s to do work <strong>and</strong> produce movement.<br />
ACTIVITY: Making your own catapult<br />
MATERIALS:<br />
• 10 ice lolly sticks or craft sticks<br />
• 4 to 6 rubber b<strong>and</strong>s<br />
• 1 plastic spoon<br />
• Bag of marshmallows<br />
INSTRUCTIONS:<br />
1. Place 8 of the sticks together <strong>and</strong> tie arubber b<strong>and</strong> tightly<br />
around one end.<br />
Chapter 3. Energy <strong>and</strong> movement<br />
43
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