MindMap Gallery motion and force
Mind map on Chapter 8 of junior high school physics, motion and force, including exploratory experiments, Newton’s first law, balance of two forces, Friction, etc.
Edited at 2024-01-26 11:45:35This article discusses the Easter eggs and homages in Zootopia 2 that you may have discovered. The main content includes: character and archetype Easter eggs, cinematic universe crossover Easter eggs, animal ecology and behavior references, symbol and metaphor Easter eggs, social satire and brand allusions, and emotional storylines and sequel foreshadowing.
[Zootopia Character Relationship Chart] The idealistic rabbit police officer Judy and the cynical fox conman Nick form a charmingly contrasting duo, rising from street hustlers to become Zootopia police officers!
This is a mind map about Deep Analysis of Character Relationships in Zootopia 2, Main content: 1、 Multi-layer network of relationships: interweaving of main lines, branch lines, and hidden interactions, 2、 Motivation for Character Behavior: Active Promoter and Hidden Intendant, 3、 Key points of interaction: logic of conflict, collaboration, and covert support, 4、 Fun Easter eggs: metaphorical details hidden in interactions.
This article discusses the Easter eggs and homages in Zootopia 2 that you may have discovered. The main content includes: character and archetype Easter eggs, cinematic universe crossover Easter eggs, animal ecology and behavior references, symbol and metaphor Easter eggs, social satire and brand allusions, and emotional storylines and sequel foreshadowing.
[Zootopia Character Relationship Chart] The idealistic rabbit police officer Judy and the cynical fox conman Nick form a charmingly contrasting duo, rising from street hustlers to become Zootopia police officers!
This is a mind map about Deep Analysis of Character Relationships in Zootopia 2, Main content: 1、 Multi-layer network of relationships: interweaving of main lines, branch lines, and hidden interactions, 2、 Motivation for Character Behavior: Active Promoter and Hidden Intendant, 3、 Key points of interaction: logic of conflict, collaboration, and covert support, 4、 Fun Easter eggs: metaphorical details hidden in interactions.
motion and force
Newton's First Law
Explore the effect of resistance on objects
① Let the car slide down the slope of the same height and material
② Use flat surfaces of different materials (such as wooden boards and cotton cloth) to compare the sliding length of the car
③The reason why a moving object stops is because it is affected by resistance. Different materials have different resistances.
The motion of an object does not require force to maintain it
Newton's first law
Content: All objects always remain at rest or move in a straight line at a uniform speed when no force is acted upon.
Based on a large number of empirical facts, generalized through further reasonable reasoning
inertia
All objects have the property of maintaining their original state of motion. In physics, this property of objects is called inertia.
understand
All objects have inertia at any time, and inertia is a property of objects
only about quality
Inertia only has magnitude, no direction
Utilization and prevention of inertia
use
approach
Tighten the hammer head by striking the underside of the hammer handle
precaution
Brake system
airbag
Two Force Equilibrium
balance force
When an object is acted upon by several forces, if it remains at rest or moves in a straight line at a uniform speed, these forces will balance each other.
Equilibrium state: remaining stationary or moving in a straight line at a uniform speed
Conditions for balance of two forces
Explore the conditions for the balance of two forces
① Place the car on a smooth horizontal surface and keep it still
②Add weights to the pallets hanging on both sides of the trolley
③Add unequal weights on both sides and observe the phenomenon
④Add weights with the same mass on both sides and observe the phenomenon
Equal in magnitude, opposite in direction, acting on the same object, acting on the same straight line
application
Skydivers should keep gravity and resistance equal in order to fall at a constant speed
Determine the motion state of an object
Friction Force
definition
Sliding friction: When two objects in contact with each other slide relative to each other, a force generated on the contact surface that hinders relative movement
direction
Parallel to the contact surface of the object and opposite to the direction of relative motion (trend) of the object
conditions for production
Two objects are in contact with each other and have pressure
Rough contact surface
There is relative motion or a tendency of relative motion between two objects
Influencing factors
Explore the influencing factors of sliding friction
① Prepare experimental equipment: three identical wooden blocks, ① ② place them on the wooden board, ③ place them on sandpaper; ② put weights on them; install the same three spring dynamometers on the three wooden blocks
①②: The greater the pressure on the contact surface, the greater the sliding friction.
①③: The greater the roughness of the contact surface, the greater the sliding friction.
Utilization and Prevention of Friction
use
Patterns on the soles and tires of running shoes increase friction with the ground
Apply anti-slip powder on hands before pull-ups and gymnastics exercises
prevent
When the machine is working, the friction of the moving parts will cause wear and tear. Try to reduce the friction.
Sweeping the ice during curling to reduce the roughness of the ice surface