lesson
Choose a material for its required properties
1 · Learn
Ceramics, polymers and composites are broad material groups. A composite combines materials to achieve useful properties, such as fibres reinforcing a surrounding matrix. The name of a group alone does not determine every member's performance.
Select properties relevant to a use: stiffness, toughness, density, heat resistance and durability are different. Environmental cost includes manufacture, use and disposal, not only the appearance of the finished object.
2 · Worked example
A lightweight reinforced panel may suit a transport application, but its repair and recycling can be harder than for a single material.
3 · Your turn
Why is 'strongest material' not enough information to choose a saucepan handle?
Check your answer
Heat transfer, temperature resistance, grip, durability and other relevant properties also matter.
4 · Apply your learning
Compare supplied material data against a design specification and justify a trade-off.
Adult guidance and safety
Use supplied evidence and approved models. Practical science needs a qualified adult, appropriate equipment and a risk assessment. Do not attempt chemical reactions, heating, mains electricity or solar observation independently. Never request personal health or genetic disclosures.
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Check a calculation · Year 5 onward
Use this only when your teacher or adult allows a calculator for the task. Show your thinking first. It does not replace mental or written arithmetic and does not mark your lesson answer.
Powers, roots and trigonometry · Year 7 onward
Use only when the task allows a calculator. Choose one operation at a time and record your working. Trigonometry here always uses degrees (DEG), not radians. Inverse sine, cosine and tangent return an angle, not a reciprocal. Keep exact fractions and π in answers when requested.
Approximate numerical results use up to 12 significant digits. Inverse sine returns −90° to 90°, inverse cosine 0° to 180°, and inverse tangent −90° to 90°; these are principal values, not every possible solution of a trigonometric equation.
My observation notebook
Follow your teacher's approved method and safety instructions. Record the sample or supplied dataset, conditions, measurements with units and uncertainties where appropriate. Distinguish observations from explanations. A described experiment is not permission to carry it out; do not improvise equipment or invent missing results.
Ask your teacher for support with the method and recording. A prediction is what you think might happen; an observation is what you actually see, hear or feel safely.
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