Practice Test Flashcards
As a ship is unloaded, it rises higher in the water because the density of the ship and its remaining cargo
increases. T/F
F
Hydraulic systems use two pistons with different surface areas to lift heavy objects. T/F
T
Wind blowing across the top of a chimney helps to draw air up the chimney. This is an example of
Bernoulli’s principle. T/F
T
As an airplane wing moves, air moves faster above the wing than below it. T/F
T
In a stationary fluid, the buoyant force is exerted equally in all directions. T/F
F
The air pressure at an altitude of 3 km is less than the air pressure at 1 km. T/F
T
Water pressure is due to the weight of the water above a particular point. T/F
T
More force is required to lift an object in water than on land because of the buoyant force of the water. T/F
F
Bernoulli’s principle states that the buoyant force acting on a submerged object is equal to the weight of the fluid the object displaces. T/F
F, it is Archimedes principle
A substance whose shape can easily change is a
fluid
A material that can easily flow is called a
fluid
Air pressure decreases as
elevation increases
Water pressure increases as
depth increases
barometer is used to measure pressure
atmospheric pressure
Which of the following is true of the buoyant force?
It acts in the upward direction
Snowshoes enable a person to walk on deep snow because the snowshoes
increase the area over which the person’s weight is distributed.
-they have a larger surface area, which spreads the person’s weight over a larger area and exerts less pressure on the snow.
A unit of pressure is called a
Pascal (Pa)
Pressure can be measured in units of
N/m2, newtons per square meter.
A ship stays afloat as long as the buoyant force is
greater than or equal to the weight of the ship:
The mass per unit volume of a substance is its
density
The braking system on a car is an example of
Pascal’s principle
Hydraulic System
Which type of substance does Pascal’s principle deal with?
fluid (liquid and gas)
One application of Pascal’s principle is
hydraulic car lift
What scientific rule describes why water squirts from a plastic bottle when it is squeezed?
Pascal’s Principle
What scientific rule states that the buoyant force on an object is equal to the weight of the fluid displaced by
the object?
Archimedes’ Principle
Which of these multiplies a force by transmitting it to a large surface area?
a. a hydraulic system
b. a buoyant force
c. a balanced pressure
d. a force pump
A
When force is applied to a confined fluid, an increase in ____________________ is transmitted equally to all
pressure
Bernoulli’s principle helps to explain
flight
According to Bernoulli’s principle, the pressure in a moving stream of fluid is ____________________ than
the pressure of the surrounding fluid.
lower
During high winds, the windows in a building may bulge outward because the air pressure inside the building
is ____________________ than the air pressure outside the building.
higher
The greater the portion of a tennis ball beneath the surface of a liquid, the ____________________ the
buoyant force on the ball.
greater
