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
4. Place a few marbles or some other light objects in the bucket. 5. Turn the broom handle with your hands to raise the bucket into the air. Turn it back the other way to return the bucket to the ground. 6. Tape the ruler straight up and down the broom handle near one end. 7. Use the ruler, which acts as awheel, to turn the broom handle and lift the pail. QUESTIONS: 1. Could you lift the bucket by turning the broom handle with your hands? Yes 2. Was it easier to lift the bucket when you turned the broom handle using the ruler? Yes 3. Replace the ruler with astick that is longer than the ruler and use the stick to turn the broom. Was it easier to lift the bucket using the long stick? Yes, the longer the ruler or stick the easier it was to lift the bucket. 4. Identify the axle in the setup. The broom handle 5. Identify the wheel in the setup The ruler or long stick 6. Write a conclusion to summarize what you learnt in this activity. We could lift the bucket by turning the broom handle. It was much easier to lift the bucket when we used the ruler. Our hand had to move further when we used the ruler, but it was easier and the bucket felt lighter. We made asimple wheel and axle machine to make it easier to lift the bucket. Now, let's put two axles and four wheels together to make a simple tractor! 58 Energy and Change
ACTIVITY: Making atractor with wheels and axles MATERIALS: • cardboard • two pencils • a small box • scissors INSTRUCTIONS: 1. Cut out four circles of the same size from the cardboard. You can use alid from a bottle or acup to trace around to get circles which are all the same. 2. Make a whole in the centre of each circle and in the bottom 4 corners of your box. a. To find the centre of the wheel draw diameter lines across the middle. b. A diameter line is the longest straight line you can draw across a circle. Where diameters cross, that is the centre. A wheel is acircle. Find the centre by drawing some diameters. In this example the centre is the red dot. 3. Push apencil through the middle of one circle and through a corner of the box. 4. Push the pencil through to the other hole on the other side of the box. 5. Then attach another circle on the end of the pencil poking out of the side of the box. Chapter 4. Systems for moving things 59
- Page 16 and 17: So we can say that food is the fuel
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- Page 46 and 47: ACTIVITY: 10 Safety tips for electr
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- Page 54 and 55: QUESTIONS Look up adefinition for p
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- Page 58 and 59: QUESTIONS Use your knowledge of spr
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- Page 84 and 85: VISIT Short video showing the sun,
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- Page 88 and 89: MATERIALS: • 100m heavy string
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- Page 106 and 107: VISIT Rocks erode to form soil (vid
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ACTIVITY: Making atractor with wheels <strong>and</strong> axles<br />
MATERIALS:<br />
• cardboard<br />
• two pencils<br />
• a small box<br />
• scissors<br />
INSTRUCTIONS:<br />
1. Cut out four circles of the same size from the cardboard. You<br />
can use alid from a bottle or acup to trace around to get<br />
circles which are all the same.<br />
2. Make a whole in the centre of each circle <strong>and</strong> in the bottom 4<br />
corners of your box.<br />
a. To find the centre of the wheel draw diameter lines across<br />
the middle.<br />
b. A diameter line is the longest straight line you can draw<br />
across a circle. Where diameters cross, that is the centre.<br />
A wheel is acircle. Find the centre by drawing some<br />
diameters. In this example the centre is the red dot.<br />
3. Push apencil through the middle of one circle <strong>and</strong> through a<br />
corner of the box.<br />
4. Push the pencil through to the other hole on the other side of<br />
the box.<br />
5. Then attach another circle on the end of the pencil poking out<br />
of the side of the box.<br />
Chapter 4. Systems for moving things<br />
59
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