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Sometimes it is not an increase in force that is desired, but an increase in  

distance or speed.  Take a baseball bat as an example.  A bat is a class 3  

lever, meaning the effort is in the middle.  This means that it has a  

mechanical advantage of less than one.  However, when the bat is swung,  

the end of the bat is travelling at a much higher speed than the location at  

which the batter is holding it.  This allows the ball to leave the bat at a  

much higher speed than it would with a class one or two lever.

Explanation:

gas

explanation:

smoke is the matter of a gas