Forces In Fluids Question Preview (ID: 35561)
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Air above an airplane wing is moving faster than air below an airplane wing. This causes the plane to
a) increase its elevation
b) accelerate
c) slow down
d) decrease its elevation
If you blow a stream of air between 2 balloons that are next to each other, the balloons
a) rise
b) move away from each other
c) move toward each other
d) move randomly
An object is dropped into a beaker containing liquid. The object drops to the bottom of the beaker. Therefore, the
a) density of the object is less than the density of the liquid
b) density of the object is greater than the density of the liquid
c) mass of the object is less than the mass of the liquid
d) volume of the liquid is displaced is more than the volume of the object
An object under water feels lighter than it does in air because of
a) air pressure
b) fluid speed
c) temperature
d) buoyancy
When pressure is applied to a confined fluid, the increase in pressure is transmitted equally to all parts of the fluid. This fact is called
a) Pascal's Principal
b) Newton's principal
c) Archimedes principal
d) Bernoulli's principal
At higher elevations, air pressure is
a) greater because there is more air below
b) less because gravity is stronger
c) less because there is less air above
d) less because the air is moving faster
Pressure is
a) force/area
b) force x area
c) area/force
d) force + area
Which of the following is NOT the SI unit of pressure?
a) N/m2
b) Pa
c) Newton
d) Pascal
Fluids exert pressure because they are made up of tiny
a) moving molecules that exert forces
b) forces that sum together
c) molecules that push upward
d) particles that are buoyant
Bubbles rise in water because they are
a) so tiny
b) more dense than water
c) less dense than water
d) fluids
The pressure exerted by the gas in the Earth's atmosphere is called
a) density
b) gravity
c) atmospheric pressure
d) water pressure
The outward pressure exerted by a fluid decreases as the speed of the fluid
a) increases
b) decreases
c) stays the same
d) none of the above
The density of a substance is its ______________ per unit of volume.
a) volume
b) area
c) density
d) mass
A device that increases force that works because of Pascal's principal, such as the braking system of a car, is called a __________________ device
a) hydraulic
b) hydro
c) piston
d) pressure
The rising of smoke up a chimney is partly explained by _________________ principle.
a) Pascal's
b) Archimedes'
c) Bernoulli's
d) Newton's
A fluid is a substance whose VOLUME can easily change
a) True
b) False
c)
d)
Water pressure INCREASES as depth increases
a) True
b) False
c)
d)
The buoyant force always acts in an UPWARD direction.
a) True
b) False
c)
d)
Archimedes' principal states that the buoyant force on an object is equal to the MASS of the fluid displaced by the object.
a) True
b) False
c)
d)
The density of an object would be changed by changing the object's volume or its MASS.
a) True
b) False
c)
d)
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