Under Pressure
Density and Random
Buoy UP!
Math in Science
Forces in Flight
100
Where is atmospheric pressure greatest?
a. at the ocean
b. where the airplane cruises
c. in a mountainside city
d. on the outer edge of the atmosphere
a. at the ocean
100
Which statement best explains why air bubbles rise to the surface in a pond?
a. a fluid can take the shape of its container
b. air is less dense than water
c. pressure is the amount of force exerted on a given area
d. the weight of the atmosphere pushes down on the water
b. air is less dense than water
100
This is used to determine buoyant force (buoyant force is equal to the weight of the volume of the water that an object displaces)
Archimedes Principle
100
An object has a mass of 4g and a volume of 2ml, what is the density of the object?
density = mass/volume
density = 4g/2ml
density = 2 g/ml
100
What is affected by an airplane's speed?
a. buoyancy
b. gravity
c. air quality
d. lift
d. lift
200
If a fluid flows from area A to area B, then area B must be an area of lower __________
Pressure
200
The amount of matter in a given volume
density
200
This is the force exerted on an object that increases as the density of the fluid increases
Buoyant force
200
a. the bottom of the meniscus
200
Why would a pilot adjust a plane's wing flaps?
a. to reduce cabin pressure
b. to increase drag
c. to decrease drag
d. to increase cabin pressure
c. to reduce drag
300
Fluid pressure is exerted equally in all directions, this explains why
a. some objects float and some sink
b. birds and airplanes fly
c. bubbles are round
d. objects seem to weigh more in air than in water
c. bubbles are round
300
The pressure in a fluid decreases as the fluid's velocity increases
Bernoulli's Principle
300
A floating, or sinking object has a weight of 15 N and a Buoyant Force of 10 N
Sinking object
300
The volume of the water in the graduated cylinder below
22.5ml
300
This is the forward force produced by an airplane's engine
Thrust
400
When you exhale, what is happening to your 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 your lungs) to high pressure (outside)
a. air moves from high pressure (in the lungs) to low pressure (outside)
400
Which of the following changes increases the overall density of the object?
a. a block of iron is formed into a hallow shape
b. a submarine fills its ballast tanks with water
c. a submarine fills its ballast tanks with air
d. a fish increases the amount of gas
b. a submarine fills its ballast tanks with water
400
Why would a 1cm3 piece of balsa wood be more buoyant than a 1cm3 piece of oak?
a. Balsa has more mass per volume
b. Oak is more dense
c. Balsa is stronger
d. Oak is less dense
b. Oak is more dense
400
The equation for density
Density = Mass/volume
400
the force that moves against the forward motion of a plane
drag
500
This is used in hydraulic devices to multiply forces
Pascal's Principle
500
Which of the following statements about fluids is true?
a. fluids rarely take the shape of their container
b. fluids include liquids and gasses
c. fluids flow from low pressure to high pressure
d. fluids exert the most pressure in the downward direction
b. fluids include liquids and gasses
500
Which of the following would not affect the level at which a boat floats in a body of water?
a. depth of the water
b. number of people in the boat
c. shape of the canoe
d. density of the canoe's material
a. depth of the water
500
What is the equation for pressure?
500
The irregular flow of fluids is called this
Turbulence