Defining pressure as force per unit area, explaining everyday examples, and calculating the pressure in a liquid from depth and density using P = hρg.
4 narrated scenes. Press play, listen and read along — the points appear as they are explained. Use ‹ Prev / Next › or the scene bar to jump to any scene.
A woman in stiletto heels can damage a floor that an elephant cannot. The difference is pressure, not weight.
Narration uses your device’s built-in voice. No sound? Switch to “Captions only” — the captions advance on their own.
Copy these into your notebook in your own words — that is how they stick.
P = F ÷ A; unit pascal (Pa) = N/m².
Smaller area gives larger pressure for the same force.
P = hρg; increases with depth and density.
Liquid pressure acts equally in all directions at a point.
The same pressure at the same depth in a liquid at rest.
The shape of the container does not matter.
About 1.0 × 10⁵ Pa.
Atmospheric pressure + hρg.
3 quick games on this lesson. Earn XP and badges as you play — your best score for each game is saved. Games are for practice and do not change your exam readiness. More games in the Physics Arcade.
8 items modelled on real CSEC Paper 1 questions. Choose one answer for each, then check. Aim for 80% or better. Work each item on paper first.
Write full answers, then reveal the mark scheme and tick the points you earned (14 marks in total). Show all your working — method marks count. Your answers are saved on this device.
Question 1 [14 marks]
A student of weight 500 N stands on both feet. The area of contact with the floor is 0.040 m². A calculator may be used.
(a) (a) Define pressure. [1]
(b) (b) Calculate the pressure exerted on the floor. [3]
(c) (c) Calculate the pressure when the student stands on one foot only (area 0.020 m²). [2]
(d) (d) A diver is 30 m below the surface of the sea (ρ = 1 030 kg/m³, g = 10 N/kg). Calculate the pressure due to the water. [3]
(e) (e) State why the diver feels more pressure at 30 m than at 10 m. [1]
(f) (f) State two factors that determine the pressure at a point in a liquid. [2]
(g) (g) Explain why a dam wall is thicker at its base. [2]
Find these in your own past-paper booklets for extra timed practice. Items above are written in the style of these papers; any adapted from a specific question say so.