Forces in Fluids

Air above an airplane wing is moving faster than the air below an airplane wing. This causes a plane to

• rise in elevation

• land safely on the ground.

• stop

Tags

NGSS.MS-PS2-2

Fluids exert pressure because they are made up of tiny moving molecules that exert forces.

• True

• false

If you divide the force exerted on a surface by the total area of the surface, you will know the amount of lift.

• True

• False

The buoyant force acting on a submerged object is equal to

• the object's mass.

• the object's volume.

• the mass of the fluid displaced by the object.

• the weight of the fluid displaced by the object.

A partially submerged object floats when

• the object's weight is equal to the buoyant force.

• the object's mass is equal to the buoyant force.

• the object's weight is greater than the buoyant force.

• The buoyant force is downward.

What must you know to calculate pressure?

• mass and force

• acceleration and momentum

• force and area

• area and mass

Answer explanation

$\Pr essure\ =\ \frac{Force}{Area}$

What is the relationship between the depth of water and the pressure it exerts?

• Depth of water has no effect on pressure

• As water pressure increases pressure decreases

• Water pressure = depth of water

• Water pressure increases as depth increases

A resting object exerts pressure equal to

• its mass times its contact area

• its weight times its contact area

• its mass divided by its contact area

• its weight divided by its contact area

The amount of water pressure you experience while swimming in a pool depends on

• your buoyancy.

• the area of the pool.

• the volume of water in the pool.

• how deep you are in the water.

Blaise Pascal discovered that changes in pressure

• are transmitted equally throughout a fluid.

• increase with depth of fluid.

• decrease with depth of fluid.

• depend on area.