"Exploration - Density of Matter" Scale, Mass and Density of the Material World PPT Courseware 5

Description

"Exploration - Density of Matter" Scale, Mass and Density of the Material World PPT Courseware 5

experiment

Divide students into three groups to do different experiments

①Group: Measure the quality of 6ml and 10ml water

②Group: Measure the mass of 10cm3 and 20cm3 copper blocks

③Group: Measure the mass of 10cm3 and 20cm3 iron blocks

in conclusion:

1. For the same substance, the mass is directly proportional to the volume.

2. For the same substance, the ratio of mass to volume remains unchanged and has nothing to do with mass and volume.

3. For different substances, the ratio of mass to volume is generally different.

The mass per unit volume of the same substance is the same;

Different substances generally have different masses per unit volume.

5. Density

In physics, the mass of a single volume of a substance is called the density of the substance.

Conjecture: The relationship between "m", "V" and "ρ"

1. Density formula: ρ=m/v

Guess: Knowing the units of m and V, how to express the unit of ρ?

2. The unit of density: kg/m3 is read as: kilogram per cubic meter.

g/cm3 pronounced as: grams per cubic centimeter

3. Conversion: 1kg/m3=10-3g/cm3

practise

1. It is usually said: "Iron is heavier than cotton", its meaning is ( )

A. The mass of iron is greater than that of cotton. B. The gravity of iron is greater than that of cotton.

C. Iron is denser than cotton D. Iron is larger than cotton

2. Density =m／v, the correct statement is ( )

A. The larger the volume of a substance, the greater its density.

The greater the mass of substance B, the greater its density.

C. The density of a substance is directly proportional to its mass and inversely proportional to its volume.

D. Density is a characteristic of matter and has nothing to do with mass and volume.

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Update Time: 2024-10-21

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume one industry PPT template

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