How Things Work
CBSE · Class 4 · EVS
Quick revision notes for How Things Work — CBSE Class 4 EVS. Key concepts, formulas, and definitions for last-minute revision.
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Key Topics to Revise
Spinning Things
- Some objects like coins and bangles spin, while erasers do not spin properly.
- The first spinner with a hole at the centre appears the same from all sides and remains upright while spinning.
- A square spinner appears circular while spinning.
Floating and Sinking
- Floating or sinking of an object cannot be decided just by whether it is heavy or light.
- Some heavy objects like an iron nail sink, while lighter ones like a leaf float.
- Changing the shape of an object can make it float or sink.
Making and Improving Boats
- Paper boats can be made after rain using old newspapers.
- Different boats can float differently in water.
- Some boats are strong, some break easily, some tip over easily, and some keep better balance.
Observing and Thinking
- Ravi notices that a spinner slows down and eventually stops.
- Questions help in learning about how things work.
- The first spinner stays upright, but the second spinner does not behave the same way.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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