"Density" Quality and density PPT courseware

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"Density" Quality and density PPT courseware

Review of the previous section

1. Objects are composed of matter _____.

2. Quality _____: _____.

1. Mass is the _____ of an object.

Mass is a fundamental property of an object, independent of its _____, _____, and __________.

2. The unit of mass is kilogram (Kg)

3. Measurement of quality

1. Commonly used tools for measuring quality in laboratories: pallet balance

2. Structure of pallet balance

3. Use of pallet balance

1) When using the balance, the balance should be placed on _______

2) Move the cursor to ______________ on the left end of the scale, and then adjust the balance nut ( ) on the beam to make the pointer align with ______________.

3) When measuring the mass of an object, the object should be placed on the ______ of the balance,

4) Use tweezers to add and subtract weights to ______ (first ______ and then ______); move the cursor (tilt ______ to the right) so that the pointer is aligned with ____________.

5) m left disk = m right disk + m game code

1. Explore the relationship between the mass and volume of an object

1. Ask questions

What is the relationship between the mass and volume of the same substance?

2. Conjectures and Assumptions

The mass of the same substance may be proportional to its volume

3. Make plans and experiments

1) Select the research object: several iron blocks of different sizes

2) Selection of equipment

m: balance

V: scale

3) Design experimental plan:

step

(1) Use a balance to measure the mass (m) of the metal block.

(2) Use the scale to measure the volume (V) of the metal block.

(3) Calculate the ratio of mass to volume (M/V) of the metal block respectively.

In physics, in order to express this property of matter, we introduce the concept of "density"

1. Definition: The mass of a certain substance per unit volume is called the density of the substance.

It is a property of matter.

2. Formula:

Density = mass/volume ρ = M/ V

Density is numerically equal to the mass per unit volume of an object

3. Unit:

kg/m3, g/cm3

try it

1. Which one is denser, a glass of water or a bucket of water? ( )

2. The density of a brick is 1.5 g/cm3. If it is divided into two pieces, what should be the density of each piece? ( )

A. 0.75 g/ cm3 B. 1.5g/ cm3

C. 3g/cm3

3. The mass of a wooden block is measured to be 10.8g and the volume is 24cm3. What is the density of the wooden block? ( )

Class Notes:

1. The ratio of mass to volume of the same substance is the same, while the ratio of mass to volume of different substances is generally different.

2. The concept of density: The mass of a certain substance per unit volume is called the density of the substance.

3. Density is a characteristic of matter.

4. Calculation formula:

Density = mass/volume ρ = M/ V

5. Unit: kg/m3, g/cm3

6. Volume unit conversion:

1m3=103dm3=106cm3

1dm3=1L=103mL

7. ρ water = 1×103 kg/m3 Physical meaning:

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Update Time: 2024-11-21

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

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