Class 9 Science — Chapter 7: Motion

What you'll learn

• ▸Concept of Motion and Reference Point
• ▸Distance vs. Displacement
• ▸Uniform and Non-uniform Motion
• ▸Speed and Average Speed
• ▸Velocity and Average Velocity

Chapter Summary

--- PAGE 1 --- Chapter 7 In everyday life, we see some objects at rest and others in motion. Birds fly, fish swim, blood flows through veins and arteries, and cars move. Atoms, molecules, planets, stars and galaxies are all in motion. We often perceive an object to be in motion when its position changes with time. However, there are situations where the motion is inferred through indirect evidences. For example, we infer the motion of air by observing the movement of dust and the movement of leaves and branches of trees. What causes the phenomena of sunrise, sunset and changing of seasons? Is it due to the motion of the earth? If it is true, why don't we directly perceive the motion of the earth? An object may appear to be moving for one person and stationary for some other. For the passengers in a moving bus, the roadside trees appear to be moving backwards. A person standing on the road-side perceives the bus alongwith the passengers as moving. However, a passenger inside the bus s…

Practice Questions from this Chapter

Tap "Get Solution" on any question to ask our AI tutor.

1. Explain relative motion simply. Get Solution →
2. What causes Earth's seasons? Get Solution →
3. Visualize zero displacement examples. Get Solution →
4. To describe the position of an object, what do we need to specify first? Get Solution →
5. What is the total path length covered by an object called? Get Solution →
6. What does the odometer in an automobile measure? Get Solution →
7. What is the SI unit of speed? Get Solution →
8. Which quantity is described as the speed of an object moving in a definite direction? Get Solution →

Did you know?

• 💡 Earth actually moves through space at an astonishing 107,000 kilometers per hour.
• 💡 Even solid rocks are constantly vibrating at a microscopic atomic level.
• 💡 The fastest human sprint recorded exceeds 44 kilometers per hour.
• 💡 Light travels so fast it circles Earth 7.5 times in one second.
• 💡 Honeybees navigate long distances using the sun and complex dances.

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