MindMap Gallery 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 11:40:00This Valentine's Day brand marketing handbook provides businesses with five practical models, covering everything from creating offline experiences to driving online engagement. Whether you're a shopping mall, restaurant, or online brand, you'll find a suitable strategy: each model includes clear objectives and industry-specific guidelines, helping brands transform traffic into real sales and lasting emotional connections during this romantic season.
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The ice hockey schedule for the Milano Cortina 2026 Winter Olympics, featuring preliminary rounds, quarterfinals, and medal matches for both men's and women's tournaments from February 5–22. All game times are listed in Eastern Standard Time (EST).
This Valentine's Day brand marketing handbook provides businesses with five practical models, covering everything from creating offline experiences to driving online engagement. Whether you're a shopping mall, restaurant, or online brand, you'll find a suitable strategy: each model includes clear objectives and industry-specific guidelines, helping brands transform traffic into real sales and lasting emotional connections during this romantic season.
This Valentine's Day map illustrates love through 30 romantic possibilities, from the vintage charm of "handwritten love letters" to the urban landscape of "rooftop sunsets," from the tactile experience of a "pottery workshop" to the leisurely moments of "wine tasting at a vineyard"—offering a unique sense of occasion for every couple. Whether it's cozy, experiential, or luxurious, love always finds the most fitting expression. May you all find the perfect atmosphere for your love story.
The ice hockey schedule for the Milano Cortina 2026 Winter Olympics, featuring preliminary rounds, quarterfinals, and medal matches for both men's and women's tournaments from February 5–22. All game times are listed in Eastern Standard Time (EST).
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.