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What are slow and fast changes? Give examples.
Explain how a metal rim slightly smaller than a wooden wheel can be fixed on it.
Why does a blacksmith heat the metal rim to fix it on a cart wheel?
What is a chemical change? Explain with example.
What is a physical change? Explain with example.
Classify the following into slow and fast changes:
(i) Spinning of top
(ii) Day and night
(iii) Formation of curd from milk
(iv) Change of season
(v) Making curd from milk by adding lemon juice
Give two examples of fast changes.
How is curd being set? Is this change reversible?
Give two examples of slow changes.
Give two examples of reversible changes.