"Quality and Its Measurement" Quality and Density PPT Courseware 4

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"Quality and Its Measurement" Quality and Density PPT Courseware 4

Give it a try, you can do it

Please classify large glasses, small glasses, small nails, hammers, desks, and chairs; tell us the reasons for classifying them, and how many categories are they divided into?

mass of object

The amount of matter contained in an object is called mass, represented by the letter m.

[Learning Objectives]:

1. Know the preliminary concept of quality and its unit of quality;

2. Know that mass is a property of the object itself, and it does not change with changes in the shape, state, and position of the object;

3. Master the use of pallet balance through practical operations;

4. Learn to use a balance to measure the mass of solids and liquids;

[Key points of learning]:

1. The unit of mass and its properties;

2. Master the use of pallet balance through practical operations.

[Difficulty in learning]: Master how to use a pallet balance.

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

Unit of mass:

1. International: kilogram (Kg)

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

3. Relationship: 1t＝103Kg

1g＝10－３Kg　1ｍｇ＝10－６Kg

Nature of mass: Mass is an attribute of the object itself. The mass of an object is determined by the amount of material contained in the object, and does not change with changes in the shape, state and position of the object.

2. Quality measurement (self-test)

1. A common tool for measuring mass in the laboratory is a balance, which is divided into tray balance and student balance.

2. When using the balance, please pay attention to:

(1). Each balance has its own weighing capacity (205g), which is the maximum mass it can weigh. The mass of the object being measured cannot exceed the weighing capacity.

(2) When adding or subtracting weights to the right plate, use tweezers. 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.

Use a balance to measure the mass of aluminum blocks and learn how to use the balance

1. Work in groups and conduct experiments

2. Communicate between groups and summarize how to use the scale

Note when experimenting:

1. How to place the balance?

2. How to adjust the balance before and during measurement? How to tell if a scale is balanced?

3. When measuring, which pan should the object and the weight be placed in? In what order do you add weights?

4. How to read the travel code? How to calculate the mass of an object?

Basic steps for using a pallet balance:

(1) Leveling: Place the balance on a horizontal platform and use tweezers to move the scale to the zero mark on the left end of the ruler.

(2) Adjust the balance: adjust the balance nut on the right end of the beam (if the pointer points to the left side of the indexing plate, adjust the balance nut to the right; otherwise, adjust the balance nut to the left) so that the pointer points to the center line of the indexing plate. , the beam is balanced at this time.

(3) Weighing: Place the object to be measured on the left pan. After estimating the mass of the object to be measured, use tweezers to add or subtract appropriate weights to the right pan in order from large to small, and move the ruler upstream appropriately. yard position until the crossbar returns to equilibrium.

(4) Reading: When the balance is balanced, the mass of the object being measured on the left disk is equal to the mass of all the weights on the right disk plus the scale value corresponding to the wandering code.

(5) Arrangement: After the measurement, use tweezers to clamp the weight back into the weight box, and organize the equipment to restore it to its original condition.

Summary and refinement

Tell us what you learned from this class:

1. What knowledge did you learn in this class?

2. What methods did you learn in this lesson?

3. Which of your abilities do you think have improved in this class?

4. What else do you want to know?

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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.

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

"Quality and Its Measurement" Quality and Density PPT Courseware 3 Learning Objectives 1. Know the definition, symbol, and unit of quality. 2. Master the use of the balance through experiments. 3. Know that mass is a property of an object by measuring its mass. Score one point, you can do it Question 1:..

"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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