"The Mass of Objects" Materials Around Us PPT Courseware 2

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"The Mass of Objects" Materials Around Us PPT Courseware 2

teaching objectives

1. Know the preliminary concept of quality and its units. Know that mass is a basic property of an object, and it does not change with changes in the shape, spatial position, etc. of the object.

2. Be able to form a perceptual understanding of mass units and be able to roughly estimate the mass of common objects.

3. Can correctly use a pallet balance to measure the mass of solids and liquids.

4. Experience the process of establishing a preliminary concept of mass by comparing the amount of matter contained in an object.

5. Develop good habits of standardized operations and a scientific attitude of seeking truth from facts.

Course standard requirements for this chapter

1. Know the meaning of mass and be able to measure the mass of solids and liquids.

2. Understand density through experiments, measure the density of solids and liquids, and explain some density-related physical phenomena in life.

3. Through experiments, understand some physical properties of matter, such as elasticity, magnetism, electrical conductivity, thermal conductivity, etc., and describe these physical properties of matter using language, text or diagrams. Understand the impact of human research on the properties of matter on daily life and technological progress.

4. Through collecting information, understand the characteristics and applications of some new materials, and understand the impact of the development of new materials on human life and social development.

1. Quality of objects

1. Mass: The amount of matter contained in an object

2.Unit:

International unit: kilogram (kg)

Commonly used units: tons (t), grams (g), milligrams (mg)

3.Conversion relationship:

1t=103kg,1kg=103g,1g=1000mg

2. Mass is a property of an object

When the shape, state, and position of an object change, the mass of the object remains unchanged.

think about it

1. After a can is flattened, does it change its shape and quality?

2. In a spacecraft, objects are in a state of weightlessness. If an object on the ground is brought to the moon and into a spacecraft, will the mass of the object change?

3. When a piece of ice melts into water, does its mass change? (Evaporation is not considered)

Conclusion: Mass does not change with changes in shape, state and position.

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

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.

How to adjust and use the balance:

1. Place the balance on a horizontal table and use tweezers to gently move the scale to the zero position on the left side of the scale.

2. Adjust the balance nut so that the pointer points to the central scale line of the index plate. At this time, the beam is balanced.

3. Place the object to be measured in the left pallet, use tweezers to add or subtract weights to the right pallet and adjust the position of the cursor on the scale until the beam returns to balance.

At this time, the mass number of the weight in the plate and the reading of the wandering code on the scale are added to get the mass of the object. The unit must be written down.

Precautions for using the balance:

1. Each balance has its own "weighing", which is the maximum mass that can be weighed. The mass of the object being measured cannot exceed the weighing capacity.

2. Use tweezers when adding or subtracting weights to the tray. Do not touch the weights with your hands, and do not get the weights wet or dirty.

3. Wet objects and chemicals cannot be placed directly into the balance tray.

think about it

1. How to measure the mass of a pin?

2. Can you measure the mass of a stamp?

What methods can you get from the above two experiments?

Here are the steps for weighing an object using a pallet balance

(A) Adjust the beam balance

(B) Place the balance on a horizontal table

(C) Move the game code to the zero mark position

(D) Place the object on the left disk

(E) Place weights or move the weights in the right disk until the beam is balanced

(F) Put the weight back into the weight box

(G) Record weighing results

The correct order should be

(B) (C) (A) (D) (E) (G) (F)

When using an adjusted pallet balance to weigh the mass of an object, it is found that the pointer is slightly to the right of the red line in the center of the index plate, then the following operation should be performed ( )

A Add weight to the right plate

B Move the game code to the right

C Turn the balance nut to the left

D Move the game code to the left

Thoughts after class:

If the position of the object and weight is tipped, how should the reading be taken?

Summary of this lesson

1. The concept of mass: the amount of matter contained in an object

2. Nature of mass: Mass is an attribute of an object that does not change with changes in the shape, state, and position of the object.

3. Measurement of quality---use of balance

Observe----Place----Adjust----Measure----Read

Operation:

Classwork: Questions 1, 2, 3, 4, and 5 on page p115.

Tutorial (preview): a. What is density? What are the units of density? How to convert? What is the formula for calculating density?

Keywords: Materials around us teaching courseware, quality of objects teaching courseware, Guangdong and Shanghai version eighth grade physics PPT courseware download, eighth grade physics slide courseware download, matter around us PPT courseware download, quality of objects PPT courseware download, .PPT format;

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Update Time: 2024-09-08

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume one industry PPT template

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