8th Grade: Chapter 4 Test "Fluids & Forces"

Front

What is the principle that explains why a boat floats in water?

Back

Archimedes' Principle states that an object submerged in a fluid experiences a buoyant force equal to the weight of the fluid displaced by the object.

Front

What is density?

Back

Density is the mass of an object divided by its volume, typically expressed in grams per cubic centimeter (g/cm³).

Front

How do you calculate the density of an object?

Back

Density = Mass / Volume.

Front

What happens to the buoyant force as an object sinks in a fluid?

Back

The buoyant force remains the same regardless of the object's depth in the fluid.

Front

What is Pascal's Principle?

Back

Pascal's Principle states that when pressure is applied to a confined fluid, the pressure change occurs throughout the fluid in all directions.

Front

What is Bernoulli's Principle?

Back

Bernoulli's Principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or potential energy of the fluid.

Front

What is the relationship between the size of a straw and the flow rate of a liquid?

Back

A larger straw allows juice to flow more quickly than a smaller straw due to less resistance.

Front

What is buoyancy?

Back

Buoyancy is the ability of an object to float in a fluid, determined by the object's density compared to the fluid's density.

Front

What is the formula for calculating the volume of a cube?

Back

Volume = Side length × Side length × Side length (V = s³).

Front

What is the effect of fluid density on buoyancy?

Back

An object will float if its density is less than the fluid's density and sink if its density is greater.