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Authoritative PPT Summary
"The cup is getting hot" PPT courseware
Part One: Learning Objectives
1. Learn to know that heat energy is transferred from one object to another; heat is always transferred from an object with a high temperature to an object with a low temperature.
2. Ability to use learned knowledge to solve problems in life.
Kind tips
The group divides the work and cooperates, observes carefully, and fills in the record sheet in time.
When heating an object, be careful not to heat it for too long. You can end the heating after observing the phenomenon. The object should not shake back and forth when heating, but should be fixed to one point for heating to avoid danger.
After the object is heated, the temperature will be relatively high. Do not touch it directly with your hands to avoid burns. Wait for the object to cool down before handling it.
The cup is getting hot PPT, part 2 content: Classroom experiment
Experimental steps:
1. Place the wax into a certain shape on the iron sheet or aluminum sheet;
2. Clamp the iron or aluminum sheet with a test tube clamp and heat it a little on the alcohol lamp;
3. Observe the sequence of wax melting and fill in the experimental report form.
Heat can be transferred along an object from a higher temperature part to a lower temperature part. This method of transferring heat is called conduction.
The cup is getting hot PPT, part three: after-class exercises
Let me answer
1. Fill in the blanks:
1. Heat can be transferred from the part with temperature ( ) to the part with temperature ( ) along ( ). This way of transferring heat is called ( ).
2. How quickly different materials transfer heat ( ).
3. If the bottom of the pot is burned with fire, the upper part of the pot will also ( ).
4. ( ), ( ), ( ), etc. are good conductors of heat, while ( ), ( ), ( ), etc. are poor conductors of heat.
2. Be a good little judge
1. Different materials have different heat transfer abilities. ( )
2. No matter what the object is, the faster it conducts heat, the better it is for people’s lives. ( )
3. Heat always travels from low-temperature objects to high-temperature objects. ( )
4. Plastic conducts heat slower than metal. ( )
science and life
1. Where in life do you need fast heat transfer? Where does heat transfer need to be slow?
Answer: Pots, radiators, etc. transfer heat quickly, while pots, kettle handles, paper cups, etc. transfer heat slowly.
How to use alcohol lamp?
Answer: ① Take off the lamp cap and put it aside. ② Use a match to light the alcohol lamp from bottom to top. ③Heat with external flame. ④Cover the alcohol lamp with the lamp cap. After the cover is off, open it and cover it again.
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"The cup is getting hot" PPT:
"The cup is getting hot" PPT Part 1 content: Learning objectives Key points: Know that heat energy is transmitted from one object to another, and always transfers from the high temperature part to the low temperature part. Difficulty: How heat is transferred in solids, and what are the differences in the heat transfer capabilities of various objects...