Momentum, analogy of an airplane taking off.
When a pilot gets clearance for take off and pulls the airplane on to
the strip he points the plane down the run way and goes through the last
series of checks and then he gives the plane full throttle and keeps it at
full throttle until he reaches take off speed and the plane lifts off the
ground. He keeps it at full throttle until he reaches a certain altitude
when he backs off on the throttle and can begin to cruise. Two things we
can draw fro this is in order to get off the ground we must give full
throttle and the other is that you can not keep it at full throttle or it
will burn up the engines. If you were to only give it half throttle you
would never get off the ground and if you were keep it at full throttle
you would burn out.
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