"Scale of Objects and Their Measurement" Scale, Mass and Density of the Material World PPT Courseware 5

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"Scale of Objects and Their Measurement" Scale, Mass and Density of the Material World PPT Courseware 5

Scale usage practice

1. In the picture, the correct way to measure the width of a wooden block using a scale is ( ).

2. The basic tool for measuring length is ____. As shown in the figure, the division values ​​of the two scales are: A__B__, and the lengths of the objects are:

A____B____.

3. Use a scale with a graduation value of 1 mm to measure the length of the object. If meters are used as the unit, there will be __ digits after the decimal point in the recorded result.

4. If the length of an object measured with a scale is 1.700m, then the division value of the scale used is ________.

5. Use a scale to measure the length of the iron rod. The recorded data is 21.15 cm. The graduation value of this scale is ________.

6. A student used a scale to measure the height of the classroom door. The readings of the three measurements were 2.14 meters, 2.16 meters, and 2.17 meters respectively. The height value of the door should be ( )

A: 2.14 meters B: 2.16 meters C: 2.17 meters D: 2.157 meters

7. There are three measuring cups A, B, and C. Their measuring ranges and graduation values ​​are: A: 500 ml, 10 ml; B: 100 ml, 1 ml; C: 50 ml, 1 ml. Now to measure the volume of a stone with a volume of about 40 cubic centimeters, you should choose ( ) in the above measuring cup

A, A B, B C, C D, all three are OK

1. Unit of volume

Do you know the conversion between these units?

1 cubic meter = 1000 cubic decimeters

1 cubic decimeter = 1000 cubic centimeters

1 liter = 1000 ml

1 liter = 1 cubic decimeter

Question 1: Can you measure the volume of the classroom?

Use the formula: volume = length × width × height

Summary: For objects composed of regular shapes like classrooms, we can use formulas to calculate

Question 2: What instrument is used in the laboratory to measure the volume of liquid?

To measure the volume of a liquid, a measuring cup or cylinder is generally used.

Thinking: Carefully observe what are the similarities and differences between the scales of measuring cylinders and measuring cups?

Similar points: there is no "0" scale

The difference: the scale in the measuring cylinder is uniform, but the scale in the measuring cup is uneven.

Do you know how to use a measuring cylinder?

(1) See its range and graduation value clearly

(2) When measuring liquid, the measuring cylinder should be placed flat on the table

(3) When reading, the line of sight should be level with the bottom of the concave liquid surface and the top of the convex liquid surface.

Thinking: How to measure the volume of an irregularly shaped object that does not dissolve in water or absorb water?

Drainage method for measuring irregular objects

Immerse it in water, and the difference between the two readings is the volume of the object - drainage method

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Update Time: 2024-06-28

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