How Things Work
CBSE · Class 4 · EVS
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What happens when you spin a coin and it starts to slow down?
Answer
When a coin slows down while spinning, it begins to shake or wobble before it finally stops spinning completely.
Name three objects that can spin properly.
Answer
Examples include: coin, bangle, wooden spinner (top), wheel, ceiling fan, potter's wheel. Any round or balanced object can spin well.
Why does a spinner with a toothpick at the center spin better than one with the toothpick away from the center?
Answer
A spinner with the toothpick at the center spins better because it is balanced. When the hole is at the center, the spinner appears the same from all sides and remains upright while spinning.
What is a charkha and how does it work?
Answer
A charkha is a spinning wheel used to twist cotton fiber into thread. It has a large wheel that spins when turned by hand. Mahatma Gandhi used the charkha to make handmade clothes.
What happens to a square-shaped spinner when it spins fast?
Answer
When a square card spinner spins fast, it appears circular while spinning due to the rapid motion that makes our eyes see a circular shape.
What is a Lattu?
Answer
Lattu is a popular Indian spinning top that is commonly made of wood. Spinning tops have been used in India for thousands of years, and in earlier times they were made of clay.
Does the weight of an object alone determine if it will float or sink?
Answer
No, floating or sinking cannot be decided based just on whether an object is heavy or light. It also depends on other factors like shape and the amount of air trapped inside.
Give an example of a heavy object that floats and a light object that sinks.
Answer
Heavy object that floats: Empty steel bowl. Light object that sinks: Iron nail or pin. This shows that weight alone doesn't determine floating or sinking.
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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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