"Quality" Quality and Density PPT Courseware 2

Description

"Quality" Quality and Density PPT Courseware 2

learning target

1. Understand the concept of mass, know the units of mass and its conversion.

2. Through practical operations, master the use of balances, learn to use balances to measure the mass of solids and liquids, and develop the habit of standardizing the use of measuring instruments; through observation and experiments, understand that mass does not change with the shape, physical state, and spatial position of objects. and changing physical quantities.

3. Cultivate students' rigorous scientific attitude and collaborative spirit through skill training on using scales.

Key points: the concept of quality; how to use pallet balances.

Difficulty: Use a balance to measure the mass of solids and liquids.

Self-learning

Question 1: What is quality?

Nails, hammers, glasses, tables, chairs, etc. in the classroom. We call these things————.

The group discusses together: nails and hammers are made of ————, glasses are made of ————, tables and chairs are made of ————.

We call iron, glass, wood, etc. matter, and all objects are made of matter.

Use of balance

1. Place the balance on a horizontal platform and place the scale at the zero mark on the left end of the ruler.

2. Adjust the balance nut of the cross beam so that the pointer points to the center line of the indexing plate. At this time, the cross beam is balanced.

3. Place the object to be measured in the left pan, use tweezers to add or subtract weights to the right pan and adjust the position of the free weight until the beam returns to balance.

Precautions

(1) Do not exceed the weighing capacity, and handle it with care when adding or subtracting weights.

(2) Weights cannot be added or subtracted by hand.

(3) Keep the balance dry and clean, and do not weigh chemicals directly.

flexibility training

1. The mass of the following objects is closest to 1 kg ( )

A. A table tennis ball B. A pen C. Two bottles of mineral water D. A bicycle

2. There are rulers and running codes on the beam of the pallet balance. The function of moving the running code to the right is ( )

A. Equivalent to adjusting the balance nut to the left B. Used instead of the pointer to indicate balance

C. Equivalent to adding a small weight to the left disk D. Equivalent to adding a small weight to the right disk

Practical application

1. Judgment:

(1) The mass of a piece of iron increases when it is put into water from the air ( )

(2) A piece of chalk writing on the blackboard has become shorter, but the quality has not changed ( )

(3) The more matter an object contains, the greater its mass ( )

(4) The mass of an iron rod does not change after being stretched into thin wire ( )

(5) The mass of an apple becomes smaller after being brought to the moon ( )

2. Fill in the appropriate units on the horizontal lines:

(1) The mass of an adult is about 60____

(2) The mass of an apple is approximately 150____

Showing off one's skills for the first time

1. Complete the following unit conversions.

(1)3×10-5t=_______kg=_______mg.

(2)4.2×106g=________kg=_______t.

2. The object with the closest mass to 50g may be ( )

A. A grain of sand B. An egg C. A pen D. A hen

3. When adjusting the pallet balance, first place the balance on _______; then move the scale to _______, and then adjust ______ so that the pointer points to _______.

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

5. When using a balance to measure the mass of an object, moving the cursor on the scale is equivalent to moving ______ into the pan of the balance.

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Update Time: 2024-07-31

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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