Four boxes, P, Q, R and S, rest on a level floor. The table gives the force each box exerts normal to the floor and the area of each box in contact with the floor.
Table: The force exerted normal to the floor and the contact area with the floor for four boxes
| Box | Force normal to the floor in N | Contact area in m2\text{m}^2m2 |
|---|---|---|
| P | 300 | 0.25 |
| Q | 480 | 0.40 |
| R | 250 | 0.10 |
| S | 600 | 0.60 |
Calculate the pressure box Q exerts on the floor.
Determine which box exerts the greatest pressure on the floor. Give a reason for your answer.
Box S is placed on a different face so that its contact area with the floor is larger. The force it exerts normal to the floor does not change. Describe what happens to the pressure box S exerts on the floor.
41 exam-style questions on AQA GCSE Physics 5.5 Pressure and pressure differences in fluids, covering 5.5.1 Pressure in a fluid and 5.5.2 Atmospheric pressure. Each one has a worked solution and a mark scheme showing where the marks go.