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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.

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Presentation on theme: "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."— Presentation transcript:

1 F = ma

2  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

3  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

4 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

5 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

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

7  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!!

8  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)


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