## How to work with Required Practicals: Part 3

You probably already know that objects float because they are less dense than water. But have you ever wondered how huge objects like ships, don’t sink? They float, even though they are made from steel, which is denser than water. This is because their hulls are full of air. They will sink into the water until enough water has been moved to match the weight of steel and air in the hull! How high they float will depend on how much they have packed on board. They will also float higher in sea water then fresh water, as salt makes the water dense, and higher in denser cold seas than in warm water. For GCSE Science  – you need to be able to explain how the measure the density of regular and irregular objects. It is one of the required practicals you must revise.

Try our new guide “How to work with Required Practicals: Part 3”. It focuses on the Physics practicals needed for Paper 1 (AQA).
It includes:

Specific Heat Capacity, Resistance  (factors affecting resistance), Resistance (in series and parallel circuits), I-V Characteristics and Calculating Density.

You will find a brief description of what you need to know about each practical, and key questions you may be asked. As always there are questions to try, and answers to check your understanding.
Click below to see the guide.
Come back and check our blog page for more resources to help you improve your understanding of different topics in various subjects.  New Maths and Science guides will be coming soon.