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Penvose, 截屏2023-10-11 19.52.00, The ball would keep rolling at a steady…

- - - - Describing that "there is proportionality between the load applied to an object and the extended length of the object"
    - - In a nutshell: The load applied to the spring is proportional to the extension length of the spring.
  - - - Pressure itself (Unit presented in N/cm2 | N/m2)
      - force (in N)
      - Area (of the 施力物体)
      - Pressure (N/m^2) = force (N) / Area (m^2)
      - 1N/m^2 = 1Pa
    - - What affects gas pressure?
        
        adding more gas: increases the pressure, because more particles hit the balloon inside
        
        decreasing volume: increases pressure because more collision in smaller space
        
        increasing temperature: increases the pressure because particles move faster
      - Atmospheric pressure: air around us exerts gas pressure to our body all the time
        
        atmosphere pressure near earth's surface is bigger, because the air particles are pulled by gravity towards the earth. If the particles are together, the pressure is bigger
      - (Explained using a balloon) the collision of air particles (moving fast) with walls of the container
    - - liquid pressure at the bottom is the highest
      - human uses strong walls to withstand the pressure
  - - - BALANCE is an important term
      - First law of motion: *unless an external force is applied, stationary objects will remain stationary, and moving object will continue to move in a straight line at a steady speed
      - inertia(惯性）- object resist changes to their motion
    - - 比萨斜塔实验
      - thought experiment->you do not need a force to keep something moving!
    - - "When a force is removed, the object will stop."
      - incorrect. He didn't understand friction
      - object move only when they're pushed
  - - - Temperament
        
        increase heat = increase particle movements = diffuse quicker and more evenly
      - Air Convection(气流）
        
        distributes the particles more quickly = quicker diffusion
- - - - Law of moment: anti-clockwise moments=clockwise moments
      - which means balancing
    - - Distance (the length of the object to the pivot, in cm or m)
      - force created by the amount of mass (in N)
      - Moment (Unit usually N/cm | N/m)
      - Moment(Nm)=Force(N) x Distance(m)