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Authoritative PPT Summary
"Quality" Quality and Density PPT
Part One: Preview Perception
1. Quality
1. Concept: How much ________ an object contains.
2.Unit:
3. The mass of an object does not change with its shape, state and position.
2. Measurement of quality
1. Measuring tools: The commonly used tools for measuring quality are _________.
2. Structure: As shown in the figure, a is ________, b is ________, and c is ________.
3. Use of balance
1. Put: Put the balance on _________.
2. Dial: Dial the game code to _________ on the left end of the ruler.
3. Adjust: Adjust the _________ at both ends of the beam so that the pointer points at _________.
4. Measure: Place the object to be measured on _________, and try to add weights to _________ in order of _________. If the balance is still unbalanced, adjust the position of _________ on the ruler to balance the balance.
5. Read: The mass of the weight _________ and the corresponding scale value on the ruler is equal to the mass of the object being measured.
6. Collect: After the measurement is completed, remove the object and put the weight back into the box using ________.
Quality PPT, Part 2: Interactive Classroom Understanding
Precautions when using a balance
(1) Before adjusting the balance of the balance, remember to move the cursor to the zero mark at the far left end of the scale.
(2) Before measuring the mass, the balance nut needs to be adjusted to balance the balance.
(3) During the measurement process, the balance nut cannot be readjusted. The balance should be rebalanced by adding or subtracting weights or moving the balance.
(4) Place objects and weights according to the principle of "left objects and right objects".
(5) When using tweezers to clamp weights into the balance tray, do so in order from large to small.
(6) Read the scale value corresponding to the left end of the travel code.
Memorize the formula: The pallet balance should be leveled, reset the balance and then adjust the balance. Place the weight on the right in the left pan, and use tweezers to hold the weight.
[Example] After Xiaojun learned how to use the scale, he wanted to weigh the quality of his grandma's bracelet.
(1) When adjusting the balance, the pointer position is found as shown in Figure A. At this time, the balance nut of the balance should be adjusted to ________ (optional "left" or "right").
(2) Picture B shows part of Xiaojun’s operations during the weighing process. The wrong operation in the picture is (just write one).
(3) After correcting the error, when the balance is balanced, the positions of the weights and the weights are as shown in Figure C. Then the mass of grandma’s bracelet is _________g.
Analysis: (1) The position of the index plate pointer is biased to the right, indicating that the right end is sinking, and the balance nut of the balance should be adjusted to the left end. (2) Error in the picture: hold the weight by hand; put the weight in the left plate and the object in the right plate, the order is reversed; the cursor is at a non-zero scale position. (3) The mass of the bracelet is m=20 g+10 g+2.2 g=32.2 g.
Answer: (1) Left (2) Put the weight by hand (put the weight in the left plate, put the object in the right plate, the order is reversed; place the slide code at the position of the non-zero scale line) (3) 32.2
Quality PPT, Part 3: Try the application
1. Quality
1. The factor that determines the mass of an object is ()
A.The shape of the object
B. The amount of matter contained in the object
C. The state of the object
D. The geographical location of the object
2.The mass of an egg is approximately ()
A.0.5 g B.5 g C.50 g D.500 g
3. my country's Chang'e-3 has successfully implemented a soft landing on the moon. Chang'e-3 is the lunar probe in the second phase of my country's Chang'e project, including a lander and a lunar rover. During the process of the lunar rover arriving from the earth to the moon for scientific exploration, The mass of the lunar rover ________(optional "get bigger", "get smaller" or "unchanged").
2. Use of balance
4. The following are some ways that Xiao Ming uses the scale. The correct one is ()
5. Use a pallet balance to measure the mass of an object. During the measurement process, the effect of moving the slider to the right is equivalent to ()
A. Adjust the balance nut to the left B. Adjust the balance nut to the right
C. Increase the weight to the right disk D. Reduce the weight to the right disk
6. When using the balance, you should first place the balance _________, and then adjust the balance nut to balance the beam. During the process of adjusting the balance of the balance beam, if you find that the pointer is biased to the right of the index plate, you should move the balance nut to _ ________(optional "left" or "right") rotate.
7. (2018·Yunnan High School Entrance Examination) Use a pallet balance to measure the mass of an object. When the balance is balanced, the positions of the weights and weights in the right pan are as shown in the figure, then the mass of the object being measured is _________g.
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