"Learning to Use Balances and Graduating Cylinders" Mass and Density PPT Courseware 2

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"Learning to Use Balances and Graduating Cylinders" Mass and Density PPT Courseware 2

How should I adjust the balance nut as shown in the picture?

The left end of the beam is too heavy, and the nuts at both ends should be adjusted to the right.

The right end of the beam is too heavy. The nuts at both ends should be adjusted to the left.

Thought 1: Which side should be used when reading the travel code? The reading of the swimming code in the picture below is ___ grams

When a classmate used a pallet balance to weigh an object, he misplaced the object in the right pan, added a 52g weight to the left pan, and moved the weight to 0.4g. The balance was balanced. The actual mass of the object should be ( )

A 51.2g

B 51.6g

C.52g

D.52.4g

When a classmate was measuring mass, he could not balance the beam no matter how he added or subtracted weights on the right side of the balance. Which of the following methods is correct ( )

A Exchange pallet

B Turn the balancing nut

C mobile game code

D Move the wandering code and turn the nut at the same time

When a classmate uses an adjusted balance to weigh the mass of an object, by adding or subtracting weights, the pointer is a little to the left of the center line of the graduation plate. This is ( )

A. Turn the nut on the right end of the beam to the right.

B Turn the nut on the right end of the beam to the left a little

C Reduce the weight on the right side of the balance

D moves the game code to the right

Tools for measuring the volume of liquids: measuring cylinder or measuring cup.

use

1. Pay attention to the measuring range and graduation value of the measuring cylinder

Usually, there are also words such as 100mL, 200mL or 500mL.

These words all indicate the maximum capacity of the measuring cylinder or measuring cup, that is, the maximum volume in milliliters that can be measured.

As shown in the picture on the right, there are scales on the wall of the measuring cylinder or measuring cup. The distance between two adjacent scale lines is the graduation value, which indicates the graduation value of the measuring cylinder or measuring cup.

2. When reading, the line of sight should be level with the bottom of the concave surface or the top of the convex surface.

1. Unit of volume:

(1)LmL

(2) m3 dm3 cm3

Conversion relationship: 1L=1000mL

1L=1 dm3 1mL=1 cm3

1 m3 = 103dm3 = 106cm3 = 109mm3

2. Graduation value of the measuring cylinder: the volume between two adjacent graduated lines.

0.5mL, 1mL, 5mL

3. Measuring range of measuring cylinder: 5mL--50mL

10mL--100mL

50mL--500mL

4. How to read the measuring cylinder: the line of sight should be aligned with the concave surface (based on the bottom) or the convex surface (based on the top).

Use a measuring cylinder to measure the volume of liquid. The water surface in the measuring cylinder is concave. When reading, the line of sight should be level with the concave surface.

Mercury is convex and water is concave.

Use a graduated cylinder to measure 50mL of water, and use a balance to measure the mass of 50mL of water

1. First use a graduated cylinder to measure the volume of 50mL of water.

2. Use a balance to measure the mass m cup of the empty glass.

3. Pour the water in the measuring cylinder into the glass, and measure the total mass m of the cup and water.

4. Calculate m water = m total - m cups, and how many grams is the mass of 50 mL of water.

How to measure the volume of small stones (displacement method to measure the volume of small solids)

1. First measure the volume V water of the water in the measuring cylinder.

2. Then throw the small stones into the measuring cylinder and measure the total volume Vtotal of the water and the small stones.

3. Then the volume of small stones V small stones = V total - V water.

practise

1. When adjusting the pallet balance, if the pointer deviates to the right end of the indexing scale, the balance nut at the right end of the beam should be rotated to _______ (fill in "left" or "right"): When measuring the mass of an object with a pallet balance, If the pointer is to the left of the graduated scale, the weight should be _______ (fill in "increase" or "decrease")

2. The volume of irregularly shaped solids can be measured with _______. When using it, you should first observe and understand its _______ and _______. When reading, the line of sight should be with the _______ bottom or _______ top of the liquid. on the same level.

3. When using a pallet balance to weigh the mass of a solid, a student did not notice that the pointer was pointing to the right of the center line of the graduated plate and thought that the balance was balanced. At this time, the mass of the solid he measured was greater than the actual mass of the solid ( )

A. Too big B. Too small C. Equal D. Too big or too small is possible

4. There is a pallet balance. When adjusting the balance of the beam, it is found that the pointer is biased to the left side of the indexing scale. At this time, if you want to balance the beam, you should ( )

A. Adjust the balance nut to the left. B. Adjust the balance nut on the right end to the right.

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

1. When adjusting the pallet balance, first place the balance on ______; then move the scale to ________, and then adjust ________ so that the pointer is aligned with ________.

2. When using a balance, the weights should be held with ______, not with hands. The mass of the object being measured cannot be greater than _________.

When taking a reading, the mass of the object being weighed is equal to the sum of ______ and ____________.

9. When using a balance, the object to be weighed should be placed on the balance ( )

A. Left disc B. right disk

C. Both left and right discs are available D. Determined according to the state of the object being weighed

10. When adjusting the balance of the balance, if the right pallet is higher than the left pallet, you should ( )

A. Adjust the game code to move to the right

B． Adjust the game code to move to the left

C. Adjust the balance nut to move it to the right

D． Adjust the balance nut to move it to the left

11． When using a balance, tweezers must be used to remove weights. The main reason is ()

A. traditional habitual

B． The weights are not easy to get dirty or rusty

C. The weight can be placed gently on the tray, and the balance is not easily damaged

D． None of the above statements are correct

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For more information about the PPT courseware "Mass and Density Learning to Use Balances and Graduating Cylinders", please click the Mass and Density ppt Learning to Use Balances and Graduating Cylinders ppt tag.

"Learning to use balances and measuring cylinders" Mass and Density PPT courseware:

"Learning to Use Balances and Graduating Cylinders" Mass and Density PPT Courseware [Experience 1] Use of Balances Activity 1: Observe that the graduation value of the scale weighing scale is _______, and the measuring range is _______. Activity 2: After balancing the scale, measure the mass of a piece of chalk. hint:..

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Update Time: 2024-07-28

This template belongs to Physics courseware Shanghai Science Edition 8th Grade Physics industry PPT template

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