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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?
Give two examples of fast changes.
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
What is a chemical change? Explain with example.
How is curd being set? Is this change reversible?
Give two examples of slow changes.
Give two examples of reversible changes.