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Grade 8 · Science · Unit 5 of 16

Pressure & Pascal's Law

Squeezing, heating and passing on force

What your child practises

Why gases compress easily and liquids do not, how heating or compressing a fluid changes its pressure and volume, and how a hydraulic press uses Pascal's law to multiply a force.

Nunavut Curriculum approved guide: Nunavut adaptation of Alberta Science 7–9 (2003), Unit A: Mix and Flow of Matter · pressure in fluids

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    A hydraulic press has a small piston with an area of 4 cm² and a large piston with an area of 24 cm². A force of 10 N pushes on the small piston. What force does the large piston exert, in N? Ignore friction.

    answer boxN

  2. Question 2

    A force of 1000 N pushes on an area of 5 m². What is the pressure in Pa (N/m²)?

    answer boxPa

  3. Question 3

    You push the plunger of a sealed syringe full of water. The water's volume…

    • hardly changes
    • doubles
    • becomes zero
    • is cut in half

  4. Question 4

    Is each fluid easy to compress, or very hard to compress?

    Sort into: 🎈 Easy to compress · 🧱 Very hard to compress

    • 🫒cooking oil
    • ♨️steam
    • 🚲air in a bicycle pump
    • 🤿gas in a scuba tank
    • 🛢️hydraulic oil
    • 🎈helium in a balloon
    • 🛞brake fluid
    • 💧water in a sealed bottle

  5. Question 5

    A hydraulic jack lifts a car. Which property of liquids makes this possible?

    • They are easy to compress.
    • They are almost incompressible and transmit pressure.
    • They expand when pushed.
    • They have no mass.

  6. Question 6

    Why are liquids hard to compress?

    • Their particles are already close together.
    • Their particles are all frozen in place.
    • Their particles do not exist.
    • Their particles are very far apart.

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