"Quality" Quality and Density PPT Courseware 7

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"Quality" Quality and Density PPT Courseware 7

Want to discuss

What are our stools and desks made of?

Which contains more wood, the podium or the desk?

What about hammers and nails?

1. Quality

Podiums, desks, hammers, and nails are called objects in physics, and the wood and iron that make up these objects are called substances.

From the above observations, we can conclude that podiums and desks contain different amounts of wood; hammers and nails also contain different amounts of iron.

Definition: In physics, the amount of matter contained in an object is called mass. Symbol m.

Similarities: They contain the same substances—rubber, water, or air.

Difference: The amount of substances contained is different, that is, their mass is different.

practise:

1. Which of the following statements about quality is correct ( )

A. Mass is the size of a substance

B. The mass is the amount of the object

C. Mass is the amount of material contained in an object

D. Mass is the size of an object

2. Which of the following statements is correct ( )

A. The mass of the lunar module decreases from the earth to the moon.

B. 1kg of iron has greater mass than 1kg of cotton.

C. After the glass is broken, its quality remains unchanged.

D. After a glass of water solidifies into ice, its volume and mass also increase.

3. Measurement of quality

1. Tools for measuring quality in life:

In daily life: What tools do you know that can measure quality?

2. Tools for measuring quality in the laboratory:

3. Structure of pallet balance

Things to note when using the balance:

(1) The mass of the weighed object cannot exceed the maximum weighing capacity of the balance.

(2) The weights should be picked up with tweezers, not by hand.

(3) Keep the balance dry and clean. Do not put wet objects and chemicals directly into the balance pan, and do not make the weights dirty to avoid rust.

How to use a pallet balance:

Before measurement

(1) Place: Place the balance on a horizontal platform

(2) Dial: Dial the cursor to the zero mark on the left end of the ruler.

(3) Adjustment: Adjust the balance nuts at both ends of the beam (the pointer moves from left to right, and from right to left) so that the pointer points to the center of the indexing plate (or the left and right swings are equal). At this time, the beam is balanced.

Practical application

1. Judgment:

(1) The mass of a piece of iron increases when it is put into water from the air ( )

(2) A piece of chalk writing on the blackboard has become shorter, but the quality has not changed ( )

(3) The more matter an object contains, the greater its mass ( )

(4) The mass of an iron rod does not change after being stretched into thin wire ( )

(5) The mass of an apple becomes smaller after being brought to the moon ( )

2. Fill in the appropriate units on the horizontal lines:

(1) The mass of an adult is about 60____

(2) The mass of an apple is approximately 150____

3. An object with a mass of 2×105 mg may be one of the following objects ( )

A. An elephant B. An apple

C. A TV D. An ant

4. There are rulers and running codes on the beam of the pallet balance. The function of moving the running code to the right is ( )

A. Equivalent to adjusting the balance nut to the left

B. Can be used to indicate balance instead of a pointer

C. Equivalent to adding a small weight to the left disk

D. Equivalent to adding a small weight to the right disk

Error Analysis

(Balance) Determine the relationship between the measurement results and the true mass of the object in the following situations

1. Before measurement, measure if the travel code is not at the zero mark ( )

2. When measuring, the pointer will read when it is tilted to the right ( )

3. The position of the weight and the object are reversed during measurement ( )

4. The weights were rusty during measurement ( )

5. The weight was damaged during measurement ( )

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Update Time: 2024-08-05

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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