MindMap Gallery Motion and Force - Junior High School Physics
Motion and Force - Junior High School Physics, summarizing motion, speed (v), Two force balance, Newton's first law, etc. Hope it helps everyone.
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Avatar 3 centers on the Sully family, showcasing the internal rift caused by the sacrifice of their eldest son, and their alliance with other tribes on Pandora against the external conflict of the Ashbringers, who adhere to the philosophy of fire and are allied with humans. It explores the grand themes of family, faith, and survival.
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motion and force
Newton's first law
Effect of resistance on movement
slope car
Control variable method: same car, same height, same slope Conversion method: compare the distance the car slides
Conclusion: The smoother the surface, the smaller the resistance. The longer the movement distance, the slower the speed decreases
Things to note
The inclination of the slope should match the length of the board
Let the car slide freely from the appropriate position on the slope
The experiment should be carried out in the proper order
Control Variable conversion method ideal experiment method experimental reasoning
Newton's first law
It’s not directly derived from experiments, it’s derived from scientific reasoning
Content: All objects always remain at rest or move in a straight line at a uniform speed when no force is acted upon
Without the action of any force, the collective effect is equivalent to zero.
Newton's first law reveals the nature of force: force is not what maintains the state of motion of an object, force is the force that changes the state of motion of an object inertia
Two force balance
Conditions for balance of two forces
same object
equal size
opposite direction
same straight line
When an object is acted upon by an unbalanced force, its state of motion changes.
Balanced state
A state in which an object is at rest or moving in a straight line at a uniform speed is called equilibrium.
speed(v)
distance/time
s/t
sports
mechanical movement
A change in the position of one object relative to another
Reference object
If an object's position relative to a reference object changes, it is said to be in motion. If its position relative to the reference object does not change, it is said to be stationary.
relativity of motion
linear motion
Uniform linear motion
Variable speed linear motion.
curved motion
Experiment
Control variable method: Agree that the car has the same height and the same slope Conversion method: compare the distance the car slides
Equipment: Inclined trolley, wooden scale
Conclusion: The smoother the surface, the smaller the resistance. The longer the movement distance, the slower the speed decreases
Things to note
The inclination of the slope should match the length of the board
Let the car slide freely from the appropriate position on the slope
The experiment should be carried out in the proper order
Control Variable conversion method ideal experiment method experimental reasoning