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covers equal distances in equal intervals of time, it is said to be in uniform motion. covers unequal distances in equal intervals of time, it is said to be in non-uniform motion. The speed of the object remains constant or 2. The speed of the object keeps changing or is uniform. non-uniform. ADDITIONAL QUESTIONS 1 What is the difference between the motion of a fan that is switched on and a wheel of a moving car? 2 Explain this statement: The motion of the moon around Earth is periodic. 5.3 Differentiate between circular motion and rotational motion. Support your answer with suitabl examples. 5.4 Which of the following is not a unit of speed? (a) km/h (b) m/s (c) s/m (d) cm/s 5.5 Which unit of speed is preferred to represent the speed of a snait m/s or mm/s? 6.6 Which instrument is used in cars to denote speed? 6.7 State the mathematical formula for average speed. 6.8 Aeroplane A travels at a speed of 720 km/h, and Aeroplane B travels at a speed of 220 m/s. Whil aeroplane travels faster? 6.9 Sumit visits his grandparents' village every year during summer. He takes a train and a bus and then walks some distance to reach there. If the train travelling at 60 km/h takes 4 h, the bus travelling at 40 km/h takes of 5 km/h for 30 min, how 0m lom 10 s 15 m 20 s​

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Réponse : Let's address each of the additional questions:

1. **Difference between the motion of a fan that is switched on and a wheel of a moving car:**

  - The motion of a fan that is switched on is rotational motion, where the blades rotate about a fixed axis.

  - The motion of a wheel of a moving car is translational motion, where the wheel moves forward along a surface.

2. **Explanation of the statement: "The motion of the moon around Earth is periodic":**

  - The motion of the moon around Earth repeats itself over time.

  - It follows an elliptical path and completes one orbit around the Earth in approximately 27.3 days.

  - This periodic motion is due to the gravitational pull between the moon and the Earth.

3. **Differentiation between circular motion and rotational motion:**

  - Circular motion involves an object moving along a circular path.

    Example: A car taking a turn around a roundabout.

  - Rotational motion involves an object spinning or rotating about a fixed axis.

    Example: Earth rotating on its axis.

4. **Unit of speed that is not valid:**

  - Option (c) s/m (seconds per meter) is not a valid unit of speed.

5. **Preferred unit of speed to represent the speed of a snail:**

  - The speed of a snail is typically very slow. Therefore, it's preferred to represent its speed in millimeters per second (mm/s).

6. **Instrument used in cars to denote speed:**

  - Speedometer is the instrument used in cars to denote speed.

7. **Mathematical formula for average speed:**

  - Average speed (v) is calculated using the formula:

    \( \text{Average speed} = \frac{\text{Total distance}}{\text{Total time}} \)

8. **Comparison of speeds between Aeroplane A and Aeroplane B:**

  - Aeroplane A travels at 720 km/h.

  - Aeroplane B travels at 220 m/s.

  - To compare, convert the speed of Aeroplane A to meters per second (m/s) and then compare the speeds.

9. **Calculation of the total distance Sumit travels:**

  - Sumit takes a train and a bus and then walks to reach his grandparents' village.

  - Given the speeds of the train and the bus, and the time taken by each mode of transport, we can calculate the total distance traveled by Sumit using the formula:

Distance = Speed * Time

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