Forces in Fluids

The buoyant force on an object in a fluid is equal to the weight of the:

• fluid

• fluid surrounding the object

• fluid displaced by the object

• object

What is the SI unit of pressure?

• the Newton

• the Pascal

The operation of a hydraulic lift system is explained by

• Archimedes' Principle

• Bernoulli's Principle

• Newton's Principle

• Pascal's Principle

Where will the greatest increase in pressure occur if you squeeze the middle of an upright, closed soft-drink bottle?

• The top of the bottle

• The middle of the bottle

• The bottom of the bottle

• The pressure will increase equally everywhere within the bottle

The upward force acting on the wing of an airplane in flight is called:

• drag

• lift

• thrust

• weight

Which of the following statements is true about an airplane wing during flight?

• Air above the wing travels faster than air below the wing

• Air below the wing travels faster than air above the wing

• The wing exerts pressure equally in all directions

• The lift acting on the wing reduces the weight of the wing

Tags

NGSS.MS-PS2-2

A cork is floating in salty water. As more salt is added to the water to increase its density, the cork will:

• float at a higher level in the water

• float at a lower level in the water

• sink

• float at the same level in the water

Fluid pressure is directed

• in all directions.

• only upward.

• only downward.

• always sideways.

Air bubbles rise in water to the surface because

• liquids cannot be compressed.

• the weight of the atmosphere pushes down on the water.

• pressure is the amount of force exerted on an area.

• water is 1,000 times denser than air.

Tags

NGSS.MS-PS2-5

What causes the pressure exerted by fluid?

• The force of gravity pulls down.

• Air exerts pressures because it has mass

• All the forces exerted by the individual particles combine to make up the pressure exerted by the fluid.