physics / newton.mdon commit [spec] tidy up remaining collated notes (36c2db1)
   1# Newtons' Laws
   2
   3> **Up is always positive**
   4
   5## First law
   6
   7Constant velocity if forces are balanced
   8- object at rest remains at rest
   9- object at motion remains in motion
  10**only** if it does not experience an unbalanced force
  11
  12## Second law
  13$$F_{net} = ma$$
  14
  15## Third law
  16
  17- Equal and opposite forces
  18- Normal force (reaction) is in opposite direction to action force
  19
  20## Inclined plane
  21
  22$$F=ma=mg\sin\theta-{\mathit{friction}}$$