Grade 8 Fluids

Grade 8 Fluids

Assessment

Flashcard

Science

7th - 8th Grade

Practice Problem

Hard

Created by

Doofenshirtz Ricky

FREE Resource

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8 questions

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1.

FLASHCARD QUESTION

Front

What is a Fluid

Back

Definition:

  • A fluid is any substance that flows. This includes liquids and gases.

➤ Properties:

  • No fixed shape — takes the shape of its container.

  • Can flow and be poured.

Can exert pressure in all directions.

2.

FLASHCARD QUESTION

Front

What is Viscosity and Flow Rate

Back

➤ Viscosity:

  • A measure of a fluid’s resistance to flow.

  • High viscosity = flows slowly (e.g., honey).

  • Low viscosity = flows quickly (e.g., water).

➤ Flow Rate:

  • The speed at which a fluid flows.

  • Measured in: mL/s or L/s.

  • Affected by temperature:

    • Liquids: warmer = lower viscosity = faster flow.

Gases: warmer = higher viscosity.

3.

FLASHCARD QUESTION

Front

What is Density

Back

Density

➤ Definition:

  • Density is how much mass is packed into a given volume.

  • Formula:
    Density=Mass/Volume(D=m/V)

➤ Units:

  • Mass = grams (g) or kilograms (kg)

  • Volume = mL or cm³ for liquids/solids; L or m³ for gases

  • Density = g/mL or kg/m³

➤ How to Find Volume:

  • Regular solids:
    Use formulas (e.g., rectangular prism: V = l × w × h)

Irregular solids:
Use water displacement method

4.

FLASHCARD QUESTION

Front

What is Buoyancy and Archimedes’ Principle

Back

Buoyancy:

  • The upward force a fluid exerts on an object placed in it.

  • If buoyant force > object’s weight, the object floats.

➤ Archimedes’ Principle:

An object placed in a fluid experiences an upward force equal to the weight of the fluid displaced.

5.

FLASHCARD QUESTION

Front

What is  Pressure in Fluids

Back

Fluid Pressure:

  • Fluids exert pressure evenly in all directions.

  • Formula:
    Pressure=ForceArea(P=FA)

    • Units: Pascals (Pa) or N/m²

➤ Pascal’s Law:

  • Pressure applied to a fluid is transmitted equally in all directions.

Used in hydraulic systems (e.g., brakes, lifts).

6.

FLASHCARD QUESTION

Front

What is Fluids in Technology

Back

➤ Hydraulics:

  • Use of liquids under pressure.

  • Based on Pascal’s Law.

  • Example: car brakes, hydraulic lifts.

➤ Pneumatics:

  • Use of compressed gases (usually air).

  • Also based on Pascal’s Law.

Example: air tools, tire inflation systems.

7.

FLASHCARD QUESTION

Front

What is Compressibility

Back

  • Liquids: not easily compressible.

Gases: easily compressible.

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