Before it is unloaded, a warehouse trolley presses on the floor with a pressure of 3200 Pa. Unloading reduces the trolley's weight to three-quarters of its earlier value. To protect a newly laid floor, the trolley is then wheeled onto a thin mat of negligible weight, which spreads the trolley's weight over an area 1.5 times as large as before.
What pressure is now exerted on the floor?
2400 Pa2400\ \mathrm{Pa}2400 Pa
6400 Pa6400\ \mathrm{Pa}6400 Pa
4800 Pa4800\ \mathrm{Pa}4800 Pa
1600 Pa1600\ \mathrm{Pa}1600 Pa
132 exam-style questions on Edexcel GCSE Physics 15.2 Pressure in fluids, covering 15.2.1 Atmospheric pressure and height, 15.2.2 Pressure in fluids, 15.2.3 Pressure, force and area, 15.2.4 Pressure and depth, 15.2.5 Pressure in liquids: depth and density, 15.2.6 Upthrust, and 15.2.7 Floating and sinking. Each one has a worked solution and a mark scheme showing where the marks go.