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air resistance

Friction, or drag, that acts on something moving through air.


Anything that flows; in particular, any liquid or gas.


When two calues change in opposite directions, so that if one is doubled the other is reduced to one half, they are said to be inversely proportional to eachother.

Newton's second

The acceleration produced by a net force on a body is directly proportional to the magnitude of the net force, is in the same direction as the net force, and is inversely proportional to the mass of the body.


The SI unit of pressure. One pascal (sympol Pa) of pressure exerts a normal force of one newton per square meter.


Force per area where the force is normal to the surgace; measured in pascals.

terminal speed

The speed at which the acceleration of a falling object is zero because friction balances the weight.

terminal velocity

Terminal speed together with the direction off motion (down for falling objects).

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