when 2 objects push or pull on each other they exert equal and opposite forces on one another
unit of force is NEWTON (N)
friction
motive force
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Resultant forces
when the resultant force on an object is zero, the object remains stationary or continues to move in the same direction and speed
the resultant force is equal to the sum of the two forces and acts in the same direction as the 2 forces
if an object is acted on by 2 unequal forces acting in different directions, the resultant force is equal to the difference between the 2 forces and in the direction of the larger force
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Force and acceleration
F = M x A
if the velocity of an object changes, it must be acted on by a resultant force
the velocity of the object decreases if the resultant force is opposite in direction to its velocity
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On the road
breaking force needed depends on the speed of the vehicle when the brakes were applied and the mass
R = M x A : resultant force
the thinking distance is the distance travelled by the vehicle in the time is takes the driver to react
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