Physical Science - Chapter 7 Part 1 Question Preview (ID: 2272)
Forces In Fluids.
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Where is atmospheric pressure greatest?
a) at the beach
b) at the top-most outer edge of the atmosphere
c) where an airplane cruises
d) in a mountainside city
If a fluid flows from area A to area B, then area B must be an area of lower FLUs1
a) pressure.
b) volume
c) temperature
d) mass
Which statement best explains why air bubbles rise to the surface in a pond
a) Air is about 1,000 times less dense than water
b) The weight of the atmosphere pushes down on the water
c) Pressure is the amount of force exerted on a given area
d) A fluid can flow and take the shape of its container
Fluid pressure is exerted evenly in all directions, which explains why
a) bubbles are round
b) objects seem to weigh more in air than in water
c) birds and airplanes can fly
d) some objects float and some sink
When you exhale or breathe out, what happens in the lungs?
a) Air moves from high pressure (in the lungs) to low pressure (outside).
b) Lung pressure decreases
c) Space in your lungs increases
d) Air moves from low pressure (in the lungs) to high pressure (outside).
What does NOT affect an airplane’s speed?
a) air quality
b) lift
c) gravity
d) buoyancy
Which of the following would NOT affect the level at which a canoe floats in a body of water?
a) depth of the water
b) density of the canoe’s material
c) shape of the canoe
d) number of people in the canoe
Why would a pilot adjust a plane’s wing flaps during a landing?
a) to increase drag
b) to increase cabin pressure
c) to reduce drag
d) to reduce cabin pressure
Why would a 1 cm3 piece of balsa wood be more buoyant than a 1 cm3 piece of oak?
a) Oak is more dense
b) Balsa is stronger
c) Balsa has more mass per unit volume
d) Oak is less dense
What is the equation for pressure?
a) pressure = force divided by area
b) pressure = force divided by monkeys
c) pressure = force divided by volume
d) pressure = force divided by distance
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