Grade 6 - Test 1 Flashcards
(32 cards)
What is force?
A push or pull on an object
Pressure (blank); gravity (blank) ; magnetism (Blank or Blank)
Options: pushes, pulls or pushes & pulls
Pressure pushes; gravity pulls; magnetism pushes or pulls.
how does a pressure cooker use pressure to cook food?
The pot is sealed except for a small pressure valve to let
just a bit of pressure out. The food cooks faster because it
is under high pressure.
What is blood pressure?
Blood pressure is how hard
the blood is pushing on the
walls of the arteries.
High blood pressure
damages the arteries and
can cause heart attacks,
but low blood pressure is
not good for the body eithe
High pressure vs. Low Pressure - which is considered bad weather and which is considered bad?
low pressure = poor weather and high pressure = good weather
True or False: The human body lives under pressure: we have the pressure of earth’s atmosphere
pushing down on us, but we are okay because we are used to it.
True
How high is the earth’s atmosphere?
100 km
what is the air pressure at sea level?
one atmosphere of pressure” or 1 atm.
when air is stacked at 100 km (the earths atmosphere) what is the force pressing on your skin?
when it is stacked that high there is about 1 kilogram of force pushing on every square centimetre of your skin.
The name “Mount Everest” has come to means?
The name “Mount Everest” has come to mean “the
greatest challenge,”
True or False: There is no oxygen in space and almost no pressure,
True
What happens to humans without air pressure?
without air pressure, the materials in our bodies become less dense, liquids turn to gas, and our bodies explode.
How has space explorations become possible?
Space exploration is possible only because we have figured out how to carry pressure. Space suits and
spaceships are pressurized, so the human body can function normally.
what happens to pressure under water?
When something is under water, it has the pressure of the atmosphere and the water combined pressing on it.
Does water weigh more than air?
Yes
What happens to pressure the deeper you go under water?
When people go under water, the pressure increases quickly, because seawater weighs much more than air.
what happens to a diver at 50 M under water?
At 50 metres below the water, a diver’s body experiences more than six times the atmospheric pressure of sea level.If he dives too deep, the pressure could be enough to crush him.
.The air that the diver breathes when he is under water is affected by one of the
basic principles of pressure:
RESPOND WITH: Increases, Decreases
As the diver goes deeper,
● the pressure from the water (Blank),
● the volume of his lungs (Blank) (his body is getting squeezed by the water, so his lungs have less space),
● therefore the density of the air in his lungs (blank) (there are more air molecules in a smaller space).
As the diver goes deeper,
● the pressure from the water
increases,
● the volume of his lungs
decreases (his body is getting
squeezed by the water, so his
lungs have less space),
● therefore the density of the air in
his lungs increases (there are
more air molecules in a smaller
space).
What happens to a divers lungs when he dives vs. when he comes back up?
When a diver is deep underwater, the water pressure compresses his lungs. When he comes up, his lungs
experience decompression: they become less compressed. If he comes up too fast, that can lead to
problems.
what is density?
density is the amount of matter in a certain space.
What happens to air molecules when density increases vs when it deacreses?
If the density of air is increased, there will be more molecules of the different gases that make up air. If the density of air decreases, there will be fewer molecules in the same space.
What happens to air pressure, molecules and density with high altitudes?
The higher one goes,
- the LESS air pressure there is,
- so the fewer air molecules there are
- and the less dense the air is.
Is there air pressure at higher altitudes?
At higher altitudes there is very little air pressure.
How high is mount everest?
9 kilometres above sea level,
