A student uses two equal masses of modelling clay. One mass is shaped into a solid ball, which sinks in water. The other mass is shaped into a hollow boat that does not let water enter, which floats on the water.
State how the average density of the hollow boat compares with the density of the water.
Compare the size of the upthrust with the size of the weight for:
The hollow boat is placed in a salt solution that has a greater density than water.
State how the fraction of the boat below the surface changes.
108 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.