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Forces In Fluids
Test Description: Ch 7
Instructions: Answer all questions to get your test result.
1) Where is atmospheric pressure greatest?
A
where an airplane cruises
B
at the ocean
C
at the outer edge of the atmosphere
D
in a mountainside city
2) If a fluid flows from area A to area B, then area B must be an area of lower
A
temperature
B
mass
C
pressure
D
volume
3) Which statement best explains why air bubbles rise to the surface in a pond?
A
The weight of the atmosphere pushes down on the water.
B
Pressure is the amount of force exerted on a given area
C
Air is about 1,000 times less dense than water
D
A fluid can flow and take the shape of its container.
4) Fluid pressure is exerted evenly in all directions, which explains why
A
birds and airplanes can fly
B
some objects float and some sink
C
objects seem to weigh more in air than in water
D
bubbles are round
5) What is affected by an airplane's speed?
A
buoyancy
B
lift
C
gravity
D
air quality
6) Which of the following would NOT affect the level at which a canoe floats in a body of water?
A
number of people in the canoe
B
density of the canoe's material
C
shape of the canoe
D
depth of the water
7) Why would a pilot adjust a plane's wing flaps?
A
to increase cabin pressure
B
to reduce drag
C
to increase drag
D
to reduce cabin pressure
8) Why would a 1 cubic centimeter piece of balsa wood be more buoyant than a 1 cubic centimeter piece of oak?
A
Oak is less dense
B
Balsa has more mass per unit volume
C
Balsa is stronger
D
Oak is more dense
9) What is the equation for pressure?
A
pressure = force/area
B
pressure = mass/volume
C
Pressure = area/force
D
pressure = volume/mass
10) When you exhale, what happens in the lungs?
A
air moves from high pressure (in the lungs) to low pressure (outside)
B
lung pressure decreases
C
air moves from low pressure (in the lungs) to high pressure (outside)
D
space in your lungs increses
*select an answer for all questions
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