"The Mass of Objects and Its Measurement" Scale, Mass and Density of the Material World PPT Courseware 4

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"The Mass of Objects and Its Measurement" Scale, Mass and Density of the Material World PPT Courseware 4

Think about it:

1. What are the similarities and differences between a nail and a pin?

2. What are the similarities and differences between a glass of water and a bucket of water?

3. What is the difference between a reinforced concrete structure building and a wooden structure building of the same size?

Give it a try, you can do it

Ask each student to classify the rubber bands, matchsticks, sections of tires, pins, large bolts, wooden blocks, etc. on the experimental table; tell them the reasons for classifying them and how many categories they are divided into?

1. Quality (mass)

The amount of matter an object contains is called mass

Explore: Is there any relationship between the size of mass and the shape, state and position of an object?

guess:

design experiment:

1. Knead a piece of plasticine into various shapes and measure its mass using a balance.

2. Let the ice melt into water and use a balance to measure the mass of the ice before and after melting.

Conclusion: Mass is a property inherent in the object itself. Under normal circumstances, it does not change with changes in the shape, state, and position of the object.

Mass (m): How much matter an object contains

1. The unit of mass in the International System of Units: kilogram (kg)

2. Other units: tons (t), grams (g), milligrams (mg)

3.Unit conversion:

1t =____kg 1g =____kg 1mg =____kg

Class exercises:

(1)80mg= _________ g =_________kg

(2)0.5t=_________kg =_________g

Think and answer the following questions based on what you have learned

1. In the International System of Units, the basic unit of mass is: ____, the symbol is ____, and the old name is ______. The unit larger than the kilogram is ______, and the unit smaller than the kilogram is __________.

2. Initially people stipulated that the mass of _____cm3 pure water at 4℃ is 1kg.

3. Later, people stipulated that the mass of a cylinder made of platinum-iridium alloy with a base diameter of 39mm and a height of 39mm is used as the standard of 1kg, which is called ________.

4. Which of the following is correct regarding the conversion of mass units ( )

A. 500g=500×1/1000kg =0.5kg

B. 0.5t=0.5×1000=500kg

C. 65kg=65×1/1000kg=0.065t

D. 75×105mg=75×105×10-3kg= 7.5×103kg

2. Measurement of object mass

1. Structure of pallet balance:

Exercise: Name the parts of the pallet balance

1. Base 2. Pallet rack 3. Pallet 4. Weighing scale

5. Balance nut 6. Pointer 7. Index plate 8. Travel code

2. How to use:

Before measurement

1. Place the balance on a level work surface

2. Move the cursor to the "0" mark on the left end of the ruler

3. Adjust the balance nut on the crossbeam so that the pointer is aligned with the scale line in the center of the index plate (how to adjust?)

When measuring

1. Place the object on the left pan of the balance and use tweezers to add or subtract weights to the right pan. (How to add and subtract weights?)

2. Move the position of the scale on the scale so that the pointer is aligned with the center line of the index plate (that is, the balance is balanced).

Reading

The mass of the object is equal to the sum of the total mass of the weights in the right pan and the number on the left end of the upstream scale.

Example: A student uses a balance to measure the mass of a metal block. The reasonable sequence of operations is

A. Place the balance on a horizontal table

B. Adjust the balance nut on the balance beam to make the beam horizontally balanced

C. Place the metal block on the left disk

D. Move the game code to the "0" point on the left end of the ruler

E. Estimate the mass of the metal block, select the appropriate weight and place it in the right pan

F. Calculate the total mass of the weights in the right disk, plus the scale value of the free weight, which is equal to the mass of the metal block

G. According to the direction of the pointer, increase (or decrease) the weight and move the weight until the beam is balanced

H. Put the weight back into the weight box and organize the recovery equipment

Class exercises:

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

A. Mass is the size of a substance

B. Mass is the mass of an object

C. Mass is the amount of matter 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 mass remains unchanged.

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

3. A cylindrical copper rod, under the following circumstances, its mass will change ( )

A. Heat the copper rod to 100℃

B. Roll the copper rod into a thin copper plate

C. Astronauts brought copper rods to the moon

D. Use a file to process the copper rod into a rectangular shape

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Update Time: 2024-11-22

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume one industry PPT template

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