Question 3
FA teacher puts a small amount of water into a metal can. She heats the can until the water boils. Steam fills the can and pushes the air out.
The teacher then seals the can with its lid and lets it cool. The can is crushed.
The Figure shows the can before and after cooling.
Figure
a.[3]
A student says:
'The can is crushed because the cooling steam sucks the sides of the can inwards.'
Explain why the can is crushed.
b.[1]
The can is crushed on all of its sides, not just on the top.
Explain why.
c.[1]
The teacher repeats the experiment, but this time she does not put the lid on the can.
Suggest why the can is not crushed.
1.3 Pressure Questions
50 exam-style questions on OCR GCSE Physics 1.3 Pressure, covering 1.3.1 Molecular motion, temperature and gas pressure, 1.3.2 Gas pressure at constant volume, 1.3.3 Compressing and expanding gases, 1.3.4 Gas volume and pressure at constant temperature, 1.3.5 Doing work on a gas, 1.3.6 The Earth's atmosphere and atmospheric pressure, 1.3.7 Atmospheric pressure and height, 1.3.8 Floating and sinking, 1.3.9 Pressure in liquids and upthrust, and 1.3.10 Pressure differences with depth. Each one has a worked solution and a mark scheme showing where the marks go.