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physics S1 - Coggle Diagram

- - - - m1v1 + m2v2 = (m1+m2)*v
- - - - the same way you calculate the average of two numbers
    - - think of acceleration as the change of velocity per unit of time
  - - - final velocity = gravitational constant(9.8m/s^2) * time
      - height fallen = (gravitational constant(9.8m/s^2) * (time)^2 ) / 2
    - - if F(weight) = F(air resistance), terminal velocity is reached
      - if F(weight) < F(air resistance), deceleration happens
      - if F(weight) > F(air resistance), acceleration happens
      - sky diving explained
        
        before parachute opens
        
        F(weight) > F(air resistance), acceleration happens yet decreasing
        
        F(weight) = F(air resistance), a relatively higher terminal velocity is reached, acceleration=0
        
        after parachute opens
        
        F(weight) < F(air resistance), strong deceleration occurs yet decreasing
        
        F(weight) = F(air resistance), a relatively lower terminal velocity is reached, acceleration=0
- - - - clockwise motion equals anti-clockwise motion, as they cancel out each other so M(res)=0
      - sum of (all clockwise forces x its distance to axis) = sum of (all anti-clockwise forces x its distance to axis)
    - - upward force applied on balance = downward force applied on balance + weight of balance
      - W+F(up)+F(down)=0
- - - - rubber/spring is stretching
    - - stored in fuels, food, batteries
    - - energy of internal molecules
    - - energy of moving body
      - kinetic energy = (mass * (velocity)^2)/2
    - - energy stored in body due to it's vertical position
      - gravitational potential energy= mass x gravitational constant x height
- - - - in uniform circular motion, the direction of resultant force is the same as centripetal force
      - direction: along the radius, towards the center
      - directly proportional to mass and velocity
      - inversely proportional to radius of the circular motion
      - formula: F=(mv^2)/R, however, you don't need to remember it for Y9 S1 Exam
- - - - If the weight line is within the base, the object turn towards its interior or remains stable if it's on a slope
      - my def: the imaginary vertical line passing through the center of mass of an object
      - If the weight line is within the base, the object turn towards its exterior or falls if it's on a slope
      - If the weight line is reaches the end of base, the object topples