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Pressure
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1994-08-31
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@Pressure is measured in:
Pa
N
m/s
@Which one of the following does the pressure exerted by an object depend on
Force and area
Mass
Gravity
@Pressure is measured in Pascals (Pa), but what else could it be measured in
N/m²
N/kg
kg/m
@In a liquid, pressure:
Increases with depth
Decreases with depth
Increases up to a point and then decreases
@In a liquid pressure does NOT depend on which one of the following?
Area
Density of liquid
Gravity
@A submarine is deep underwater. A pressure p1 pushes on the sides and a pressure p2 pushes from below. Which one of these statements is correct?
p1 = p2
p1 is greater than p2
p2 is greater then p1
@A container full of water has a small hole at the bottom through which water escapes. As the water level (H) falls then the distance (L):
#pre4
Gets less
Stays the same
Becomes larger
@The diagram shows a container of water with a hole. The distance the water is going is L. If you wanted L to remain constant you would have to:
#pre4
Keep the water level in the container the same
Make another hole in the container
Completely fill the container
@The diagram shows a piston in a container. If the substance inside the container was a liquid then the piston:
#pre1
Would not move whatever force was applied
Could move down easily
Would move easily at first, but then become difficult
@Shoes with stiletto heels are more likely to damage a wooden floor because:
the heel point exerts a high pressure
frictional forces are increased
the person walking is not stable and wobbles slightly
@Camels have large flat feet. Why?
So they do not sink into the sand
To improve heat loss
To increase friction and get a better grip
@A dam holds back water. How does the thickness of the dam vary from top to bottom?
It gets thicker towards the base
Its wider at the top than at the base
It must have a constant thickness, otherwise it wouldn't be stable
@For aircraft, at high altitudes, which one of the following is correct?
The pressure inside the cabin is greater than that outside
The pressures inside and out must be exactly the same
There is greater pressure outside the aircraft than inside
@Why do astronauts wear spacesuits on the Moon?
Because there is no outside air pressure
Because they need oxygen
To protect them from dangerous solar radiation
@The greatest pressure is exerted on the floor when:
standing on tiptoe, on only one foot
standing with both feet flat on the floor
standing on only one foot, flat on the floor