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"Why Bicycle Tires Burst" PPT download
Part One Content: Classroom Experiment
Independent learning: Why do bicycle tires burst under sunlight?
We already know that liquids expand with heat and contract with cold, but does air also expand with heat and contract with cold?
In-class exploration:
Experimental method one
Put the balloon on the flask, heat it with hot water, and see that the balloon bulges up. Then cool it with cold water, and the balloon will deflate immediately.
Experimental method two
A drop of red ink is placed in a curved glass tube. When heated, the red ink moves outward. When cooled, the red ink moves inward.
Issues to note in the following experiments
1. Use alcohol lamp safely and light it with lighter.
2. Cover the lamp with an alcohol lamp cap and cover it twice in a row. Do not blow it out with your mouth.
3. Use the outer flame of the alcohol lamp to heat the object.
4. It is forbidden to touch the copper ball. The copper ball will burn the skin after heating.
Key points and difficulties: How do you think this experiment should be done?
There is a copper ball here and a metal ring. The copper ball just can pass through the metal ring. We will use this device to conduct experiments.
Part 2: Summary
Through experiments, we found:
Copper balls have the property of thermal expansion and contraction.
Solids also have the property of expanding with heat and contracting with cold.
Gas has the property of ( )
Solids also have the properties of ( )
Liquids also have the properties of ( )
Objects generally have the properties of ( )
Part Three: Classroom Exercises
In-person quiz:
1. As long as a flattened table tennis ball is not broken, it can bulge up by boiling it with hot water. This is because the air inside the table tennis ball is heated (volume expansion).
2. Generally speaking, the volume of an object will (expand) when it is heated, and its volume will (contract) when it is cooled.
3. Through experiments we know: Under normal circumstances. Liquids, solids, and gases all have the property of (thermal expansion and contraction).
4. The length of wires installed outdoors will change (A) in summer and (B) in winter. A. long B. short -
5. If the plastic bottle cap is too tight to open, just put the cap part into (B) to expand the cap and make it easier to unscrew. A. In cold water B. In hot water
6. When doing experiments on thermal expansion and contraction of air, the container holding the air should be (A).
A. Sealed B. Open
7. In the experiment of thermal expansion and contraction of air, the function of putting the balloon on the mouth of the bottle is (B C).
A. To blow up the balloon B. To seal the bottle
C. Use the balloon to detect changes in the volume of air in the bottle.
8. Why are bicycle tires prone to bursting in hot summer? Why do the workers who repair the road leave a gap every other section?
My guess: Gas expands with heat and contracts with cold, so bicycle tires are prone to bursting in hot summers.
Solids also have the property of thermal expansion and contraction. Workers building roads must leave a gap at intervals.
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"Why Bicycle Tires Burst" PPT courseware:
The first part of the PPT courseware "Why Bicycle Tires Burst": Explore the thermal expansion and contraction of gases Experimental equipment: solid thermal expansion and contraction instrument, alcohol lamp, matches, sink, cold water Experimental steps: First observe whether the copper ball can pass through the metal ring ; Use an alcohol lamp to heat the copper ball..
"Why Bicycle Tires Burst" PPT:
"Why Bicycle Tires Burst" PPT Part One: Questions and Answers Please make bold assumptions before answering: Under normal circumstances, liquids have the properties of thermal expansion and contraction. Does air also have the characteristics of thermal expansion and contraction? Experimental method 1. Put the air filled...