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$$F=ma=mg\sin\theta-{\mathit{friction}}$$