The Four Forces Affecting Flight
“What is a FORCE?”
A forces is a __ __ __ __, __ __ __ __
__ __ __ __
or __ __ __ __ __.
__ __ __ __
__ __ __ __ __ __
__ __ __ __ __ __ __
Four Forces of Flight
Before a person can understand __ __ __ __ __ __, they must first learn about the __ __ __ __ __ __ that
control flying. A force is a __ __ __ __ or __ __ __ __ in any direction.
Gravity Force
__ __ __ __ __ __ __ is an invisible __ __ __ __ __ which pulls objects together. Objects with large mass pull
and attract objects with less mass. Because the __ __ __ __ __ has a very __ __ __ __ __ mass, all objects
near it are pulled towards the centre of the Earth. This downwards “pull” is called the
__ __ __ __ __ /__ __ /__ __ __ __ __ __ __ and works against things that are trying to fly.
Drag Force
__ __ __ __ is a force that __ __ __ __ __ you down and works in the __ __ __ __ __ __ __ __ direction than
you are travelling. For example, when a parachute on a dragster opens up after the race, it creates a
__ __ __ __ / __ __ __ __ __ that helps to slow the car down.
Lift Force
Lift is a force __ __ __ __ __ __. If the lift force is __ __ __ __ __ __ __ than the gravity force, the object will
__ __ __ __ in the air.
Thrust
This is the force that moves an airplane __ __ __ __ __ __ __ and is usually produced by a plane’s engine.
drag
force
gravity
pull
stay
drag
forces
gravity
pull
thrust
drag force
force of gravity
large
push
twist
Earth
forward
lift
push
upward
flight
greater
opposite
slows