# Tổng hợp kiến thức vật lý 6 đầy đủ nhất (+ lý thuyết, công thức & bài tập)

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Here is the post general knowledge of physics 6 most detailed and complete. This lesson not only systematizes the entire theory and formulas to remember in the two chapters of mechanics and thermodynamics, but also practice answering related review questions. Thereby, helping students master general knowledge to understand the details of the lesson, and at the same time prepare well for school exams.

## Synthesize knowledge of physics 6 semesters 1 – mechanics

Learning physics 6 chapters of mechanics, we understand some concepts like what is force? What is gravity? What is volume? What types of simple machines are there, how do they help people… Here are the theory & formulas to remember.

### Mechanics chapter theory

Synthesize knowledge to remember the chapter of mechanics

STT Knowledge to remember

Content

first

Length measuring tool

Some tools used to measure length such as straight ruler, tape measure, tape measure …
2

Measuring limit of ruler

GHD is the maximum length recorded on the ruler
3

Minimum division of ruler

DCN is the length between 2 consecutive divisions on the ruler

How to calculate the LDC of the ruler: DCN = (Large number – small number)/number of segments

4

Length unit

A quantity used to measure the distance between two points

The legal unit of length is the meter (symbol: m).

There are also millimeters (mm), centimeters (cm), decimeters (dm), kilometers (km)…

5

How to measure length

Step 1: Estimate the length to measure

Step 2: Choose the right measure

Step 3: Measure and read the correct result

6

Volumetric Instrument

Measuring cup and graduated cylinder are two instruments used to measure liquid volume
7

Is the maximum value recorded on the top line on the flask.
8

Minimum division of the graduated cylinder

Is the volume between two consecutive divisions on the flask
9

Unit of volume measurement

In the International System of Units (SI), the standard unit of volume is the cubic meter (m³).
ten

What is volume?

Mass is a measure of the amount of substance in an object
11

Mass measuring instrument

The most common mass measuring instrument is the balance. Some types of scales such as: swing scales, Robecval scales, medical scales, watch scales, electronic scales, etc.
twelfth

Unit of mass measurement

The official unit of mass in our country is the kilogram, symbol Kg .
13

What is force?

A force is any influence that causes an object to change, either affecting its motion, direction, or its geometrical structure.

There are different types of forces such as: push, pull, suction, friction, etc.

14

Force measuring instrument

Using a dynamometer we can measure the magnitude of the force
15

Unit of force measurement

The unit of force is the Newton
16

Effect symbol

WOMEN
17

Direction and direction of force

Direction can be vertical, horizontal, oblique

Dimensions can be from top to bottom or bottom to top

#### 18

Two forces balance

How to determine two balancing forces

• Two forces must act together on an object

• Two forces in the same direction but opposite

• Two forces of equal magnitude

19

What is gravity?

Gravity is the force of gravity on the earth
21

Direction and direction of gravity

Gravity is vertical. Top-down (towards the earth)

21

What is weight?

The weight of an object is the magnitude of the force of gravity acting on the object

The weight symbol is P .

22

Spring dynamometer

Spring dynamometer is used to measure the magnitude of the force

The spring dynamometer structure includes: dynamometer housing, spring, indicator needle, two hangers, graduated scale

23

How to identify elastic objects?

When an object is impacted by a force, it deforms, but when the object stops, it returns to its original shape => the object is elastic.
24

What is specific gravity?

The mass of one cubic meter of a substance is called its density
25

The unit of measurement of specific gravity

The unit of density is kilograms per cubic meter (kg/m³).
26

How to determine the density of a substance?

The density of a substance is determined by the mass of a unit volume (1m3) of that substance: D = m/V
27

What is specific gravity?

The weight of one cubic meter of a substance is called its specific gravity
28

Specific weight unit

N/m³
29

Simple mechanical machines

Simple machines are tools that make work easier

3 types of simple machines:

Truckle

Lever

Incline

30

The effect of different types of pulleys

• The fixed pulley has the effect of changing the direction of the pulling force compared to when pulling directly

• The moving pulley has the effect of making the force pulling the object up less than the weight of the object.

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### Mechanics chapter formulas to remember

Students memorize the formulas below so that they can apply them to solve the 6 physics chapter of mechanics

 Recipes to remember Note The formula for calculating spring deformation: Δl = l – lo Δl: Spring strain lo: Initial length of spring (natural length) l: Length of spring after deformation The formula for relation between weight and mass: P = 10.m P: Weight of the object m: Mass of the object The formula for calculating the density of an object: D = mV D: Density (Kg/m³) m: Mass (Kg) V: Volume (m³) Formula for calculating specific gravity of an object d = PV D: Specific gravity (N/m³) N: Newton P: is the weight (N) V is the volume (m³) Formula for calculating specific gravity by specific gravity: d = 10 x D d: Specific gravity, unit of specific gravity is N/m3 D: Density

see more
: All 6th grade physics formulas to remember

### Some units to remember

The unit of measurement is a very important piece of knowledge to remember, in many types of exercises we need to convert to the correct unit of measurement to be able to solve the problem correctly. Below is a table of unit conversion and how to convert units of length, mass …

#### Cubit

duhoc-o-canada.com</b>)” ></p><p dir=" ltr="">Each unit is 10 times more than the next unit, each of the following units is 1/10 of the previous unit

#### Unit of measurement of mass

Kg: Kilogram

Hg: Hectogram

Dag: Decagram

G: Gram

Other units: Tons, weights, oats Two units of mass that are 10 times more or less adjacent to each other

The large unit in front is 10 times larger than the adjacent smaller unit (1 quintal = 10 nests).

The smaller unit behind is equal to 1/10 of the previous unit (for example, 1 nest = 1/10 quintal)

#### Time unit

 Time unit Symbol (if any) 1 minute = 60 seconds 1p = 60s 1 hour = 60 minutes 1h = 60p 1 day = 24 hours 1 day = 24 hours

see more
: Physics mind map 6 chapters of thermodynamics easy to understand and remember

## Synthesize knowledge of physics 6 semesters 2 – thermodynamics

Through this chapter, we will answer some questions such as how do substances expand because of heat? What is melting, freezing, evaporation and condensation?…

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### Chapter theory of thermodynamics

 STT Knowledge to remember Content first Conclusions about thermal expansion of solids When the temperature increases, the solid expands, when the temperature decreases, the solid contracts Different solids expand at different temperatures 2 Conclusions about thermal expansion of liquids Liquids expand when heated, contract when cooled Different liquids expand at different temperatures 4 Conclusions about thermal expansion of gases Gas expands when heated, contracts when cooled Different gases expand because of the same heat 5 Application of thermal expansion of solids, liquids, and gases Application of thermal expansion of solids Crafting dual tapes In the field of machine manufacturing Applying objects such as knife handles, sickles, etc. Application of thermal expansion of liquids Application of thermal expansion of gases 6 Uses and working principles of thermometers Thermometer used to measure temperature The principle of operation of the thermometer is: It works based on the phenomenon of thermal expansion of substances 7 What factors does the evaporation rate depend on? The rate of liquid evaporation depends on 4 factors: temperature, wind, surface area, and properties of each type of liquid. 8 Concepts of melting, freezing, evaporation, condensation and boiling Melting and freezing The change from solid to liquid state of a substance is called melting. Conversely, the change from liquid to solid is called solidification. Evaporation and Condensation The change from liquid to vapor is called evaporation. The change from vapor to liquid is called condensation. Boiling Boiling is the process of changing from a liquid to a gas that occurs both inside and on the surface of a liquid.

### Thermodynamics chapter formulas to remember

1°C = 1.8°F

#### Formula to convert degrees F to degrees C

°C = (°F – 32°F)/1.8°F

#### Formula to convert degrees Celsius to degrees Fahrenheit

°F = °C x 1.8°F + 32°F

### Some units to remember

#### Unit of volume measurement

The volume unit conversion table to remember duhoc-o-canada.com</b>)” ></p><p dir=" ltr="">Note: With each unit of volume standing close together, the larger unit is 1000 times smaller

Formula to convert liters (L) to other units of volume measurement

• 1 L = 1000 ML

• 1 L = 1000 cm3

• 1 cm3 = 0.001 L

• 1 L = 1 dm3

• 1 L=0.001 m3

• 1 m3 = 1000 L

## Some questions to review physics knowledge 6

Question 1: Fill in the missing words in the following sentences

1. The unit of length is …………………….

2. The unit of volume measurement is …………..

3. The unit of force is …………………….

4. The unit of measurement for mass is ………….

5. The unit of measurement for density is…

Verse 2: Proceed to change the following units

1.05 km = …… m

105 dm = …….m

0.25 m3 =……..dm3

1.05 quintal =………kg

290 g = ………….kg

Verse 3What is the push and pull effect of one object on another called?

Question 4: Use the words in the following three boxes to make 5 different sentences

 Attraction – thrust – traction
 Soccer ball – ping pong ball – plow – nail – piece of iron

Buffalo

Football goalkeeper

Nail pulling pliers

Bar magnet

Table tennis racket

Question 5: If there are only two forces acting on the same object at rest, what are the two forces called?

Verse 6: Give an example to prove the existence of gravity?

Verse 7: An object has a weight of 250 N. What is the mass of the object?

Verse 8: Fill in the blanks with suitable words

a, The density of copper is 8900…….

b, The weight of a dog is 70…….

c, Specific gravity of cooking oil is 8000…..

d, The volume of water in a water tank is 3……

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Verse 9: Name 3 types of simple machines that you have learned

Question 10: What are the uses and working principles of thermometers? Which thermometer is used to measure the human body temperature?

Question 11: Why is it easier to break when we pour nóng water into a thick glass than when we pour nóng water into a thin glass?

Question 3: Force

Question 4:

The buffalo exerts traction on the plow

The soccer goalkeeper exerts a force on the soccer ball

The nail extractor exerts a pull on the nail

The bar magnet exerts a force of attraction on the iron piece

The ping pong racket exerts a force on the ping pong ball

Question 5: Two forces balance

Question 6:

Dropping a piece of chalk, the chalk falls to the ground because the earth exerts a force of attraction on the chalk.

Humans living on earth do not fall into space because of the gravity of the earth

Verse 7: We have P = 10.m => m = P/10 = 250/10 = 25 kg

Verse 8:

a, Kilograms per cubic meter

b, Newton

d, Newtons per cubic meter

e, Cubic meter

Verse 9: Lever, inclined plane, pulley

Question 10:

Thermometer used to measure temperature

Thermometers work based on the thermal expansion properties of liquids

Use medical thermometer to measure human body temperature

Question 11:

When pouring water into a thick glass, the inner glass layer in contact with the water will heat up first and expand. While the outer layer of glass has not yet heated up and has not expanded. As a result, the outer glass layer suffers from the inside out and the cup breaks. With a thin cup, the inner and outer glass layers heat up and expand at the same time so the cup does not break.

Here is the post general knowledge of physics 6 of the two chapters of mechanics and thermodynamics. duhoc-o-canada.com hopes that through this, the students will have the opportunity to review again what they have learned so that they can recall and understand the definitions and formulas of 6th grade physics better. Good luck with your 6th grade Physics.

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