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Physics Definitions (Newtons Laws of Motion (laws 1&2= conservation of…

- - - - change in
        
        velocity
        
        measured by
        
        speed
        
        distance/time as in m/s
        
        direction as cardinal directions N,E,S,W
      - examples: start moving , stop moving, go faster, slow down, turn
  - - - mvr where r=radius
- - - - The orbit of a planet is an ellipse with the Sun at one of the two foci.
      - a line between the sun and the planet sweeps equal areas in equal times
      - P^2=a^3
        
        P= orbital period
        
        a=semimajor axis
        
        semimajor axis is the radius of the longest part of the ellipse
      - only valid for planets orbiting the sun
- - - - density: mass/volume