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Forces Revision (Equations (Kinetic Energy (Word (Half of the mass…

- - - - Half of the mass multiplied by the velocity squared.
    - - (1/2) x m x v^2
  - - - Force multiplied by Distance
    - - F x d
  - - - Ci V/t
    - - Change in Velocity divided by Time
  - - - Displacement x Time
    - - S x T
  - - - Force = Mass x Acceleration
    - - F = m x a
- - - - The acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.
    - - If the resultant Force acting upon an object is zero, then the forces are said to be unbalanced.
    - - An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
  - - - Factors
        
        Braking Distance
        
        See aforementioned
        
        Thinking Distance
        
        See aforementioned
      - Energy Transfers
        
        Chemical Energy -->Kinetic Energy --> Thermal Energy
      - Thinking Distance + Braking Distance
    - - Why does speed affect braking distance compared to thinking distance?
        
        Speed affects Braking Distance compared to Thinking Distance as the braking distance is how long it takes to stop, meaning it is affected by more factors than thinking distance, such as friction and road surface.
      - Braking Distance
        
        Factors
        
        The distance it takes for you to apply enough pressure on the brakes so that the car stops.
      - Thinking Distance
        
        The distance taken for your brain to process that you need to stop the car.
        
        Factors
- - - - Eventually, he reaches his terminal speed when the air resistance and weight become equal. They're said to be balanced.
        
        When the canopy opens it has a large surface area which increases the air resistance. This unbalances the forces and causes the parachutist to slow down.
        
        As the parachutist slows down, his air resistance gets less until eventually it equals the downward force of gravity on him (his weight). Once again the two forces balance and he falls at terminal speed. This time it's a much slower terminal speed than before.