8.2 Fluids

Multiple Choice

A ___ is defined as any matter that flows when a force is applied.

• solid

• gas

• fluid

• atom

Multiple Choice

The ___ of a liquid is the ratio of mass to volume.

• mass

• volume

• density

• temperature

Multiple Choice

The density of most solids decreases slightly as temperatures increase because solids ____ when heated.

• expand

• contract

• stay the same

• both expand and contract

• none of the answers are correct

Multiple Choice

Most materials ____ denser in their solid state than in their liquid state.

• are

• are not

Multiple Choice

Which of the following substances is NOT denser in their solid state?

• oil

• alcohols

• water

• none of the answers are correct

Multiple Choice

When water freezes its volume ___ slightly, while its mass stays the same causing it to expand.

• decreases

• increases

Multiple Choice

Buoyancy is the measure of the ___ force a fluid exerts on an object that is immersed within in.

• lateral

• downward

• upward

• neutral

Fill in the Blanks

Buoyancy explains why some objects float and some objects

.

Multiple Choice

When will an object float?

• When the buoyant force is GREATER than its weight.

• When the buoyant force is LESS than its weight.

Multiple Choice

When does neutral buoyancy occur?

• When the buoyant force is equal to the weight of the object.

• When the buoyant force is greater than the weight of the object.

• When the buoyant force is less than the weight of the object.

Multiple Choice

Archimedes' principle is

• why boats float.

• why planes fly.

Multiple Choice

Buoyant forces are created by difference in

• temperature.

• mass.

• density.

• volume.

Multiple Choice

An object with the same density of water has neutral buoyancy because the weight of the water displaced is ___ as the weight of the object.

• the same

• heavier

• lighter

• none of the answers are correct

Multiple Choice

Pressure acts in all directions, not just the direction of the applied force.

• This is a false statement.

• This is a true statement.

Fill in the Blanks

What creates pressure?

Fill in the Blanks

Gravity creates pressure because fluids have

.

Multiple Choice

Pressure is caused on the atomic level by ___ between atoms and molecules.

• bonding

• collisions

• electrical charge

Multiple Choice

Pressure and energy ___ related.

• are

• are not

Fill in the Blanks

We get useful

when we let a fluid under pressure expand.

Multiple Choice

Bernoulli's principle explains

• why boats float.

• why planes fly.

Multiple Choice

If speed goes __; pressure goes ___.

• down; down

• up; down

• up; up

• none of the answers are correct

Fill in the Blanks

Viscosity is a property of fluids that causes

.