How Things Work
Class 4 · The World Around Us · 10 Questions
Do you think all objects can spin? Make a list of a few objects that can spin.
Collect the objects mentioned in the table given below. Spin and observe them. Then, complete the table.
| Objects | I observe | I wonder | I think |
|---|---|---|---|
| Coin | As it slows down, it begins to shake | Why does it start to shake as it slows down? | |
| Bangle | As time passes, the sound... | ||
| Pencil | |||
| Piece of Stone | |||
| Wooden Spinner (Top) | |||
| Eraser |
Which of the spinners did not spin properly? Discuss the possible reasons.
Have you noticed the position of the hole in the first two spinners? Did this difference in the position of the hole make a difference in the spinning of these spinners?
What other changes can you make in your spinner? Can you colour it? How many different ways can you colour it?
What happens to the colours on the spinner when it is painted with different colours and then spun?
What other things have you observed spinning?
Did all the light objects float and all the heavy objects sink? Name the heavy objects that floated and lighter objects that sank.
When Ravi spins a spinner, he notices that it slows down and eventually stops. He is curious about this and asks his teacher some questions. List at least two questions that he could ask.
Classify the objects below based on whether they float or sink in water. Objects: Wax, Marble, Thermocol, Candle, Coin, Cork, Leaf, Eraser, Spoon, Ice-cube, Potato, Tomato, Pumpkin, Lemon