MindMap Gallery Basic concepts of force and buoyancy
Student party benefits! A picture will help you review the concepts and buoyancy. What are the three elements of force? What tools are needed to measure the size? What are the common forms of force? What are the characteristics of pressure? What formulas do you need to know about buoyancy? This guide will tell you all at once!
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This is a mind map about bacteria, and its main contents include: overview, morphology, types, structure, reproduction, distribution, application, and expansion. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about plant asexual reproduction, and its main contents include: concept, spore reproduction, vegetative reproduction, tissue culture, and buds. The summary is comprehensive and meticulous, suitable as review materials.
This is a mind map about the reproductive development of animals, and its main contents include: insects, frogs, birds, sexual reproduction, and asexual reproduction. The summary is comprehensive and meticulous, suitable as review materials.
force
concept of force
definition
Force is the action of an object on an object
unit
Newton N
The effects of forces between objects are mutual
two forces
Action and reaction forces
two objects
Objects exerting force and objects receiving force
Example
When it is useful, if the hand paddles backward, the person will swim forward. The physical principle is: When paddling, the hand exerts a backward force on the water, and the water exerts a forward reaction force on the hand.
force effect
Change the motion state of an object
changes in movement status
speed change
speed up, slow down
direction change
Turning, circular motion
Change the shape of an object
Draw the bow and knead the plasticine
three elements of force
size, direction, point of action
force diagram
Measuring tools
spring dynamometer
principle
The elongation of a spring is proportional to the tension
use
Gently pull the hook to see if it is stuck.
Check whether the pointer is aligned with the zero mark and whether it needs to be zeroed.
Pull the spring dynamometer at a constant speed along the direction of the force to measure
common force
gravity
force exerting object
Earth
size
Directly proportional to quality
G=mg
g=9.8N/kg
direction
straight down
application
Heavy vertical line
point of action
center of gravity
Use two forces to balance two suspensions to determine the center of gravity position
Increase object stability
lower center of gravity
Increase support area
Elasticity
force due to elastic deformation of an object
size
Deformation size
The elasticity of an object
direction
direction of restoration
point of action
point of contact
Friction
forces that hinder relative motion
size
pressure
Roughness
calculate
Two force balance
direction
opposite to the direction of relative motion
point of action
contact surface
pressure
Force acting vertically on the surface of an object
belongs to elasticity
pressure
pressure effect
size
pressure level
The size of the force-bearing area
calculate
Definition
Cylinders and cubes are placed horizontally
p=ρhg
unit
Pascal Pa Pa
liquid pressure
Features
There is pressure in all directions inside the liquid
The pressure is equal in all directions at the same depth
The internal pressure of a liquid is directly proportional to the depth and density of the liquid
calculate
p=ρhg
buoyancy
Causes
The difference between the upward and downward pressure of a liquid on an object
Weighing method
Archimedes formula
balancing act
float, levitate
Floating and sinking conditions
sink
levitate
float up
float