F = ma

 When forces are balanced…  Fnet = 0  At rest or  Moving at a constant velocity  Newton’s 1 st law applies  What happens if the forces are not balanced?  Newton’s 2 nd law applies

 An object will always accelerate in the direction of the NET force.  F NET = m × a m kg a m/s 2 So F= kgm/s 2 = N

acceleration (m/s 2 ) Force (N) As the force on the object increases the rate at which it accelerates increases. a = kF Slope(k) = a/f = 1/m

acceleration (m/s 2 ) Mass (kg) As the mass of the object increases the rate at which it accelerates decreases. a = km -1 contant(k) = ma or F

 Forces are unbalanced!  Object is NOT in equilibrium  Your greater force always points in the direction of the motion. Accelerate FaFf Fg Fn

 A measure of the pull of gravity on a mass. (caused by the Earth)  Fg = m × g  Units: Newtons (N) – this is the metric version of pounds Caution: Mass is m (kg) and it is not the same as weight!!

 More force means greater acceleration.  More mass means less acceleration.  Objects will always move in the same direction as the net force.  Objects of different mass have different weight BUT the same acceleration(g)