MindMap Gallery Chapter 1 Mechanical Movement
Chapter 1 of 8th grade physics, Mechanical Movement, includes detailed knowledge points such as the description of movement, the speed of movement, the measurement of speed, the measurement of length and time, etc. It is rich in content, the key points are sorted out, the structure is clear, and the system is complete! Very worth learning!
Edited at 2024-10-14 21:36:06Dive into the world of the Chinese animated film Nezha 2: The Devil's Birth! This knowledge map, created with EdrawMind, provides a detailed analysis of main characters, symbolic elements, and their cultural significance, offering deep insights into the film's storytelling and design.
This is a mindmap about Nezha 2, exploring its political metaphors and cultural references. The diagram highlights the symbolism behind the Dragon Clan’s suppression, drawing parallels to modern geopolitical conflicts and propaganda manipulation. It also details Chinese historical and cultural elements embedded in the film, such as the Jade Void Palace, Ao Bing’s armor, Taiyi Zhenren’s magic weapon, and Nezha’s hairstyle.
This is a mindmap about the main characters of Nezha 2, detailing their backgrounds, conflicts, and symbolic meanings. It explores the personal struggles and transformations of Nezha, Ao Bing, Shen Gongbao, and Li Jing as they navigate themes of rebellion, duty, ambition, and sacrifice.
Dive into the world of the Chinese animated film Nezha 2: The Devil's Birth! This knowledge map, created with EdrawMind, provides a detailed analysis of main characters, symbolic elements, and their cultural significance, offering deep insights into the film's storytelling and design.
This is a mindmap about Nezha 2, exploring its political metaphors and cultural references. The diagram highlights the symbolism behind the Dragon Clan’s suppression, drawing parallels to modern geopolitical conflicts and propaganda manipulation. It also details Chinese historical and cultural elements embedded in the film, such as the Jade Void Palace, Ao Bing’s armor, Taiyi Zhenren’s magic weapon, and Nezha’s hairstyle.
This is a mindmap about the main characters of Nezha 2, detailing their backgrounds, conflicts, and symbolic meanings. It explores the personal struggles and transformations of Nezha, Ao Bing, Shen Gongbao, and Li Jing as they navigate themes of rebellion, duty, ambition, and sacrifice.
1. Mechanical movement
1. Measurement of length and time
length
unit
Unit: kilometers (basic) centimetres, nanometers
Conversion: number × rate unit (5cm=5x10⁻²m=0.05m)
Symbol: km.m.dm.cm.mm.μm.nm
tool
Scale (commonly used), vernier caliper (precision), laser rangefinder (precision)
Scale usage
Three things to look at before measuring: zero scale line, measurement range (range), and graduation value
Five meetings
Select (measuring range, graduation value)
Place (close to, parallel to)
Look (facing vertically)
Read (estimate to the next digit of the graduation value)
Remember (with unit)
Estimate
The thickness of the bank card is 1mm, the width of the little finger is 1cm, the width of the palm is 1dm, and the height of the blackboard is 1m
Pencil length 17.5cm, table height 75cm, room height 3m, middle school student height 1.6m
The length of the textbook is 26cm, the diameter of the table tennis ball is 4cm, the paper thickness is 0.1mm, and the length of the chalk is 1dm.
The coin is 2mm thick, the haze particles are 2.5μm, and the DNA is 3nm in diameter.
Special measurement methods: translation, turning curves into straight lines, rolling wheels, breaking whole into parts, accumulation (paper, money...), turning darkness into light
time
unit
Hours, minutes, seconds and nanometers
tool
Ancient: Guibiao, sundial, hourglass, hourglass
Now: mechanical stopwatch (stop watch), clock, electronic stopwatch, mobile phone stopwatch, cesium atomic clock
Estimate
The pulse beats 70 times in 1 minute, one beat takes 0.86 seconds, one breath takes 3-4 seconds, and one step takes 0.5 seconds.
The national anthem played for 46 seconds, and the eraser fell from the table to the ground for 0.4 seconds.
error
Concept: The difference between a measured value and a true value
Reasons: 1. Tool accuracy; 2. Different estimated values; 3. Environmental impact
It cannot be eliminated, only reduced. Errors can be eliminated
Reduction methods: 1. Choose precision tools; 2. Improve measurement methods; 3. Find the average of multiple measurements
2. Description of movement
mechanical movement
Object position changes over time
Reference object
The object selected as the standard when judging the movement or rest of an object
Selection principles: exclusive (not a research object), specific, assumed (static), arbitrary, not unique, convenient, and identical
The relativity of motion and rest
Motion is absolute - all objects are in motion
Stillness is relative - it is stillness relative to a reference object
3. Speed of movement
Compare two methods
1. Same as t than s (i.e. speed)
2. Same as s than t
average speed
Roughly describe the speed of movement over a certain distance or period of time
Average speed calculation v=s/t, s is the total distance, t is the total time
speed
Physical meaning: describes how fast an object moves
Definition: the ratio of distance to time
Formula: v=s/t, deformation t=s/v, s=vt
Unit conversion: 1m/s=3.6km/h
Movement form
Uniform linear motion
Along a straight line with constant speed
v is a fixed value and is not directly or inversely proportional to st
variable speed linear motion
Along a straight line with changing speed
4.Measurement of speed
Experimental principle v=s/t
Equipment: scale, stopwatch (also long wooden boards, wooden blocks, trolleys, metal sheets)