chap 5 fm Flashcards
(19 cards)
in 1903 who became the first to fly planes
the wright brothers
what american physicist developed the early rocket
robert Goddard
what is lift
the upward force resulting from differences in air presure above and below the planes wings that cause it to rise
what is drag
a force that resists forward motion through a fluid it operates in the direction opposite to thrust
what are the two forces that work against flight
weight and drag
how does an airplane provide lift
when there is more air pressure under the wings airfoil make this happen
when an airplane is in flight, which is better, the combined forces of lift and thrust or the combined forces of weight and drag how
lift and thrust because if there is an equal force between the two, the plane still moves
why are the wings of a space shuttle useless for most of the flight
because there is no air in space to provide lift
to make an airplane turn right what wing does the pilot have to increase drag on why
on the right wing this will make the left side move faster causing the plane to move right
what effect does lowering the flaps on a plane
it will slow the plane down because they increase both drag and lift causing it to fly at lower speeds.
how are action-reaction forces used in a rocket
there is aluminum metal and aluminum perchlorate and plasticlike material that holds these together when the boosters ignite the aluminum metal and aluminum perchlorate react and produce hot gases that are pushed out of the engine nozzles
how is releasing a balloon similar to launching a rocket
the air of the balloon pushes on the sides of the ballon in the same way a rocket does
hydrogen and oxeygen react chemically to produce water how does his fact help explain why these elements are used as fuels in the space shuttles
because the two elements make steam the steam exists the main engines at the temp of 2,000 degrees c making a powerful thrust.
the space shuttle spends much of each of its missions in the vacuum of space yet its streamline is shaped to reduce air resistance explain please
since the shuttle has such a large mass its velocity is small more efficient for moving through the octmes
how can changing the shape of an object make it more buoyant
you can increase the volume and if you increase volume you can decrease density and if it is less dense than water it floats.
how can Archimedes principle be used to find the volume of an object
if an object is placed in water it will displace the volume of water equal to its own
what happens to the density of water as it freezes to form ice
it decreases because the water expands then it floats on water
why do objects tend to feel lighter underwater
because the force of bouyence counteracts the force of gravity
What are the two problems that had to be overcomed for a person to safely explore the ocean
water pressure, light, heat
