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EdrawMindChapter 3 Movement and Force
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Chapter 3 Movement and Force
Including force, force measurement, gravity, two-force balance, sliding friction, the relationship between motion and force, etc. Helps sort out some knowledge points in physical mechanics.
Edited at 2024-02-03 11:40:00- One Hundred Years of Solitude Character Relationship Chart
One Hundred Years of Solitude is the masterpiece of Gabriel Garcia Marquez. Reading this book begins with making sense of the characters' relationships, which are centered on the Buendía family and tells the story of the family's prosperity and decline, internal relationships and political struggles, self-mixing and rebirth over the course of a hundred years.
- One Hundred Years of Solitude Character Relationship Chart
One Hundred Years of Solitude is the masterpiece of Gabriel Garcia Marquez. Reading this book begins with making sense of the characters' relationships, which are centered on the Buendía family and tells the story of the family's prosperity and decline, internal relationships and political struggles, self-mixing and rebirth over the course of a hundred years.
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Project management is the process of applying specialized knowledge, skills, tools, and methods to project activities so that the project can achieve or exceed the set needs and expectations within the constraints of limited resources. This diagram provides a comprehensive overview of the 8 components of the project management process and can be used as a generic template for direct application.
Chapter 3 Movement and Force
- One Hundred Years of Solitude Character Relationship Chart
One Hundred Years of Solitude is the masterpiece of Gabriel Garcia Marquez. Reading this book begins with making sense of the characters' relationships, which are centered on the Buendía family and tells the story of the family's prosperity and decline, internal relationships and political struggles, self-mixing and rebirth over the course of a hundred years.
- One Hundred Years of Solitude Character Relationship Chart
One Hundred Years of Solitude is the masterpiece of Gabriel Garcia Marquez. Reading this book begins with making sense of the characters' relationships, which are centered on the Buendía family and tells the story of the family's prosperity and decline, internal relationships and political struggles, self-mixing and rebirth over the course of a hundred years.
- Project Management Process Template
Project management is the process of applying specialized knowledge, skills, tools, and methods to project activities so that the project can achieve or exceed the set needs and expectations within the constraints of limited resources. This diagram provides a comprehensive overview of the 8 components of the project management process and can be used as a generic template for direct application.
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- Outline
Chapter 3 Movement and Force
3.1 Force
Force (symbol: F, unit: N)
Definition: The effect of one object on another object
Interpretation
Objects in contact with each other do not necessarily produce a force
Forces can also occur between objects that are not in contact
The effects of forces between objects are mutual (the object is both a force-exerting object and a force-receiving object)
force effect
Deform, change state of motion
three elements of force
Size (represented by the length of the line segment)
Direction (indicated by arrow direction)
Point of action (represented by the starting point of the line segment)
3.2 Measurement of force
Deformation: elastic deformation (recoverable) and plastic deformation (irrecoverable)
Elasticity: The force produced due to elastic deformation is called elasticity
spring dynamometer
Principle: The elongation of the spring is proportional to the tension
Instructions for use: Return to zero, do not exceed the range, stand vertically upward, line of sight is perpendicular to the scale surface, remain stationary or move evenly when reading.
3.3 Gravity
Gravity (symbol: G, unit: N)
Definition: The force exerted on an object due to the attraction of the earth is called gravity
Force object: Earth, direction: vertically downward
Center of Gravity: The point where gravity acts on an object
FormulaG=mg
The mass of an object is proportional to gravity
At the same place, the ratio of the object's gravity to its mass is a certain value, usually 9.8N/kg, called g
g increases with latitude and altitude, and g varies from planet to planet.
3.4 The combination of two forces on the same straight line
Resultant force: When several forces act together on an object, their effect can be replaced by a force, which is called the resultant force of those forces.
synthesis of force
same direction
Size: F=F1 F2
Direction: Same as F1 and F2 directions
opposite direction
Size: F=F big-F small
Direction: Same as the general direction of F
3.5 Two force balance
balance
Balance: An object is at rest or moving in a straight line at a uniform speed (equilibrium state)
Balance force: The force on an object when it is in equilibrium
Two force balance conditions: same body, equal magnitude, opposite direction, same line
3.6 Sliding friction
sliding friction
Definition: When an object slides relative to the surface of another object, a phenomenon occurs that hinders relative sliding.
Size: equal to the pulling force
Direction: Opposite to the direction of movement
Influencing factors: pressure, roughness, material properties
Increase and reduce friction methods
Increase beneficial friction: increase pressure, increase roughness
Reduce harmful friction: reduce pressure, reduce roughness, change sliding to rolling
static friction
Conditions of occurrence: Two objects are in contact with each other and have a tendency of relative motion.
Three elements: point of action, direction, size
Range: 0~f large
3.7 Relationship between motion and force
inertia
The property of an object to maintain uniform linear motion or rest is called inertia
All objects have inertia under any circumstances
Inertia is an inherent property of all objects
The amount of inertia an object has is related to its mass
When the initial velocity of an object is the same, the smaller the resistance it receives, the smaller the distance the object moves, and the slower the velocity changes.
law of inertia (promote ideal ideas)
All objects always remain at rest or in a state of uniform linear motion until an external force forces it to change this state (Newton's first law)
The motion of an object does not require force to maintain it. Force is what changes the state of motion of an object.