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Pressure – practice for Years 7–8

Sample questions on Pressure with the right answer and a worked solution, from easy to hard. In the Pickles Academy app a child gets new questions of the same kind every time, so they can't just learn the answers by heart.

Subject
Physics
Year
Years 7–8
Curriculum area
Pressure in fluids

Question types: Calculating pressure

Rule: Pressure

p = F ÷ A: force in newtons, area in m², pressure in pascals (1 Pa = 1 N/m², 1 kPa = 1000 Pa).

Change the area to m² first: 1 m² = 10 000 cm².

Example: 125 N on 250 cm² = 0.025 m²: p = 125 ÷ 0.025 = 5000 Pa = 5 kPa

Watch out: From cm² to m² divide by 10 000, not by 100: 250 cm² = 0.025 m².

Sample questions

  1. Question 1 Easy

    A crate presses on the floor with a force of 4000 N over an area of 5 m². What pressure does it exert?

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    Answer: 800 Pa

    How it works: p = F ÷ S = 4000 N ÷ 5 m² = 800 Pa.

  2. Question 2 Normal

    An object presses on a surface with a force of 2000 N over 500 cm². What pressure does it exert? Give the answer in kPa.

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    Answer: 40 kPa

    How it works: 500 cm² = 0.05 m²; p = 2000 N ÷ 0.05 m² = 40 000 Pa = 40 kPa.

  3. Question 3 Hard

    What is the pressure in a liquid with a density of 1200 kg/m³ at a depth of 28.5 m? Give the answer in kPa. Use g = 10 N/kg.

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    Answer: 342 kPa

    How it works: p = h × ρ × g = 28.5 m × 1200 kg/m³ × 10 N/kg = 342 000 Pa = 342 kPa.

Related topics

All Physics topics

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