Unit Two Physics 1

Unit Two Physics 1

Vector
1. Has Magnitude
2. Has Direction
3. Examples
  1. Velocity
  2. Displacement
  3. Force
Scalar
1. Has magnitude
2. No direction
3. Examples
  1. Speed
  2. Distance
Adding Vectors
1. Same direction
  1. Add vectors
    1. Get resultant
Subtracting Vectors
1. Opposite direction
  1. Add a negative
    1. Get resultant
Head and Tail winds
1. Head Winds
  1. Reduces speed
  2. Acts as a resistive force
  3. Minus the forces
2. Tail Winds
  1. Act as a driving force
  2. Increases speed
Vectors not on the horizontal
1. Triangles
  1. Join the heads and tails
  2. Resultant found by joining the tail of the first with the head of the second
  3. Find
    1. Magnitude
      1. Pythagrus Theorum
    2. Direction
      1. Find the angle
        Trigonometry
Cross currents
1. Flow parallel to the bank
2. Take boats off course
3. When solving them
  1. Draw north line
Lift drag and Thrust
1. Caused by the shape of the wing
  1. Top of the wing is curved more than the bottom
    1. Air moves faster on top then under
      1. Faster air produces less pressure above then bellow
        Creates a net upward force
2. Driving force
  1. Produced by pull of propeller or push of jet engine
    1. Forces exhaust backwards pushing it forward
3. Risistive force of the air
  1. Slow aircraft down
4. Thrust=drag when traveling at a constant speed
Resolving velocities
1. If you have an angle and a resultant
  1. Split into an easterly and northerly component
    1. Use to find initial velocity of horizontal and vertical forces

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