"Quality and Its Measurement" Quality and Density PPT Courseware 3

Description

"Quality and Its Measurement" Quality and Density PPT Courseware 3

learning target

1. Know the definition, symbol and unit of mass.

2. Master the use of the balance through experiments.

3. By measuring the mass of an object, we know that mass is a property of the object.

Give it a try, you can do it

Question 1: Listed below

①What are objects?

②What are substances?

③What is the relationship between matter and objects?

tables, stools, wood, hammers, nails, iron, glass, small glass pieces, glass bottles

Question 2:

①Compared with iron hammers and nails, ______ contains more iron and ______ has a greater mass.

②Compared with stools, ______ contains more wood and ______ has greater mass.

③Therefore, the substances contained in objects are divided into ______.

④____________ is called quality

1.Quality

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

2. Symbol: m

3.Unit:

International unit: kilogram (kg)

Common units: tons (t), grams (g), milligrams (mg)

Conversion relationship: 1t=103kg, 1kg=103g, 1g=103mg.

What are the units of mass in the International System of Units? What is the symbol? What is the conversion relationship between them? Ask students to read the textbook and solve the problems themselves.

the mass of some object

Electronic 10-31 kg Adult 50-70kg

A hydrogen atom is 1×10-27 kg. An elephant can reach 6.0×103kg.

Influenza virus is about 10-19 kg, whales can reach 1.5×105 kg

Bacteria are about 10-11 kg. Large ocean freighters are about 107kg.

Pin approx. 80 mg Earth 6.0 ×1024 kg

One yuan coin approximately 20g Sun 2.0 ×1030 kg

Newborn 2-5 kg ​​Milky Way approximately 1041 kg

One egg is about 50 g

[Tracking Exercise 1]

1. Please fill in the appropriate units for the following physical quantities:

①The mass of an adult man is approximately 60____;

②The mass of an elephant can reach 6.0____;

③The mass of an egg is about 50 ____.

2. Complete the following unit conversions

①50t=______ kg=_____g=_____mg;

②8000mg=_____g=_____kg =_____t.

Tracking exercise two

1. The following are several steps for using a pallet balance to weigh the mass of an object: The correct sequence should be _______.

A. Adjust the beam balance.

B. Place the balance on a level table.

C. Place the travel code at the zero mark.

D. Place the object on the left disk.

E. Put a weight or move the weight in the right plate until the beam is balanced.

F. Put the weight back into the weight box.

G. Record the weighing results.

2. A classmate uses a pallet balance with an adjustment number to measure the mass of a book. When the balance is balanced, the weights on the right pan are: one 100g weight, two 20g weights, one 10g weight, and one 5g weight. The position of the wandering code is as shown in the figure: then the mass of this book is _____. If this experiment is taken to the moon, the measurement result will be _____ (increased, smaller, or unchanged).

After 3.6kg of water freezes into ice, the mass of the ice is __kg; the mass of an 18kg aluminum block heated to melting is ___kg.

〔Target Detection〕

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

A. An elephant. B. An apple. C. A television. D. An ant.

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. When adjusting the balance of the balance beam, place the balance on a horizontal table and observe that the cursor is at the zero mark of the scale, but find that the pointer is pointing to the left side of the index plate. In order to balance the beam, the correct operation is ( )

A. Move the cursor on the ruler to the right.

B. Add weight to the right pan of the balance.

C. Turn the balance nut on the right end of the beam to the right.

D. Turn the balance nut on the right end of the beam to the left.

4. Use the adjusted balance to weigh the mass of the object. When the object to be measured is placed in the left pan and a 35g weight is added to the right pan, the balance pointer moves to the right of the indexing plate. At this time ( )

A. Add weight to the right plate. B. Reduce the weight in the right disk.

C. Move the game code to the right. D. Adjust the balance nut on the right end to the left.

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For more information about the PPT courseware "Mass and Density Mass and Its Measurement", please click the Mass and Density ppt Quality and its Measurement ppt tag.

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"Quality and Its Measurement" Quality and Density PPT Courseware 2:

"Quality and Its Measurement" Quality and Density PPT Courseware 2 What is the definition of quality? The larger one contains more plasticine, while the smaller one contains less plasticine. Which one uses more rubber material, car tires or bicycle tires? Think about it: a reinforced concrete building of the same size...

"Quality and Its Measurement" Quality and Density PPT courseware:

"Quality and Its Measurement" Quality and Density PPT Courseware

All objects are composed of matter, and they vary in size, shape, and amount of matter contained. In this chapter we have a preliminary understanding of the quality of matter.

Mass of an object and its measurement:

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Update Time: 2024-11-22

This template belongs to Physics courseware Lu Jiao edition eighth grade physics volume 1 industry PPT template

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