__________ is the force per unit area applied on the surface of an object.
What determines whether an object will sink or float?
|A)||whether gravity acts on the object in the fluid|
|B)||whether a buoyant force acts on the object|
|C)||the direction of the buoyant force on the object|
|D)||whether the buoyant force is larger than the object's weight|
The supporting force exerted by a fluid on an object immersed in it is called __________.
Bernoulli's principle states that as the velocity of a fluid __________, the pressure exerted by the fluid __________ .
An object weighing 50 kg is floating in a fluid. What is the buoyant force of the fluid on the object?
|A)||> 50 kg|
|B)||< 50 kg|
|C)||Not enough information is given.|
At what depth is the buoyant force on a submerged object the greatest?
|A)||The buoyant force on a submerged object is the same at any depth.|
|B)||at the surface|
|C)||on the ocean floor|
|D)||at sea level|
Pressure is defined as __________.
|A)||pressure = area/force|
|B)||pressure = mass/acceleration|
|C)||pressure = force/area|
|D)||P1 = P2|
What two things must you know to calculate the pressure exerted on a surface?
|A)||the force that is applied and the density of the surface|
|B)||the area over which a force is applied and the mass of the object applying the pressure|
|C)||the force and the area over which it is applied|
|D)||the force and the weight of the object|
As the height of a fluid above a surface __________, the pressure exerted by the fluid on that surface __________.
|D)||The pressure exerted by a fluid on a surface is unaffected by the height of the fluid.|
A __________ is any substance that has no definite shape and can flow.
Which of the following is NOT a fluid?
If a cube is submerged in water, where on the cube is the pressure exerted by the water the greatest?
|A)||The pressure is equal on all sides of a cube.|
|B)||on the bottom|
|C)||on the sides|
|D)||on the top|
An instrument called a(n) __________ is used to measure atmospheric pressure.
According to Pascal, pressure applied to a fluid __________.
|A)||increases as it moves through the fluid|
|B)||fluctuates as it is transmitted throughout the fluid|
|C)||decreases as it moves through the fluid|
|D)||is transmitted unchanged throughout the fluid|
In which direction is pressure by a fluid exerted on an object that is submerged in it?
|B)||parallel to the vertical surfaces, perpendicular to the horizontal surfaces|
|D)||perpendicular to all surfaces of the object|
The same force is applied to two different objects. The area over which the force is applied to object A is twice as large as the area over which the force is applied to object B. Which of the following statements is true of these objects?
|A)||If the same force is used, the pressure exerted on the objects is the same.|
|B)||The pressure applied to object A is equal to the square of the pressure applied to object B.|
|C)||The pressure exerted on object B is twice as great as the pressure exerted on object A.|
|D)||The pressure exerted on object A is twice as great as the pressure exerted on object B.|
A(n) __________ uses a fluid to increase an applied force.
|C)||wheel and axle|
What is the approximate pressure exerted on your body by the atmosphere at sea level?
How does Bernoulli's principle explain how airplanes fly?
|A)||Air pressure is greater below the wings, creating lift.|
|B)||Air pressure is greater on the top of the wings, creating lift.|
|C)||The air pressure on top of the wing is equal and opposite to the air pressure on the bottom, creating a balanced upward force.|
|D)||The backward force exerted by an engine creates an equal and opposite push, resulting in lift.|
Archimedes' principle states that __________.
|A)||the buoyant force on an object is greater than the weight of the fluid it displaces|
|B)||the buoyant force on an object is equal to the weight of the fluid it displaces|
|C)||when the speed of a fluid increases, the pressure exerted by the fluid decreases|
|D)||pressure applied to a fluid is transmitted unchanged throughout the fluid|