Unit Two Physics 1

Unit Two Physics 1

1. Vector

   • Has Magnitude
   • Has Direction
   • Examples
     • Velocity
     • Displacement
     • Force

2. Scalar

   • Has magnitude
   • No direction
   • Examples
     • Speed
     • Distance

3. Adding Vectors

   • Same direction
     • Add vectors
       • Get resultant

4. Subtracting Vectors

   • Opposite direction
     • Add a negative
       • Get resultant

5. Head and Tail winds

   • Head Winds
     • Reduces speed
     • Acts as a resistive force
     • Minus the forces
   • Tail Winds
     • Act as a driving force
     • Increases speed

6. Vectors not on the horizontal

   • Triangles
     • Join the heads and tails
     • Resultant found by joining the tail of the first with the head of the second
     • Find
       • Magnitude
         • Pythagrus Theorum
       • Direction
         • Find the angle
           • Trigonometry

7. Cross currents

   • Flow parallel to the bank
   • Take boats off course
   • When solving them
     • Draw north line

8. Lift drag and Thrust

   • Caused by the shape of the wing
     • Top of the wing is curved more than the bottom
       • Air moves faster on top then under
         • Faster air produces less pressure above then bellow
           • Creates a net upward force
   • Driving force
     • Produced by pull of propeller or push of jet engine
       • Forces exhaust backwards pushing it forward
   • Risistive force of the air
     • Slow aircraft down
   • Thrust=drag when traveling at a constant speed

9. Resolving velocities

   • If you have an angle and a resultant
     • Split into an easterly and northerly component
       • Use to find initial velocity of horizontal and vertical forces