Motion — Flashcards
Tamil Nadu Board · Class 9 · Science
29 flashcards for Motion (Tamil Nadu Board Class 9 Science) to test yourself on key terms and facts. Part of the Tamil Nadu Board Class 9 Science syllabus.
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What is motion? Give one example of an object in motion that you see daily.
Answer
Motion is the change in position of an object with respect to its surroundings. Example: A car moving on the road, a fan rotating, a person walking, or a train traveling are all in motion. Motion is r…
Why does a tree on the roadside appear to move backward when you travel in a car, even though the tree is actually stationary?
Answer
Motion is relative. From the car's reference frame (moving observer), the tree appears to move backward because the observer's position is changing. From a person standing on the road, the tree is at …
A person walks 500 m east, then turns and walks 300 m west. Calculate: (a) Total distance covered, (b) Total displacement.
Answer
(a) Distance = 500 m + 300 m = 800 m (total path length) (b) Displacement = 500 m - 300 m = 200 m east (straight line from start to final position) Key difference: Distance is scalar (800 m), displace…
Define distance and displacement. Why is displacement always less than or equal to distance?
Answer
Distance: Actual length of path traveled (scalar quantity, always positive). Displacement: Straight-line change in position from start to end (vector quantity, has direction). Displacement ≤ Distance …
A car covers 60 km in the first hour, 60 km in the second hour, and 60 km in the third hour. Is this uniform or non-uniform motion? Why?
Answer
This is uniform motion. The car covers equal distances (60 km) in equal time intervals (1 hour each). In uniform motion, an object covers equal distances in equal intervals of time, regardless of the …
Why does a bus in heavy traffic show non-uniform motion? Explain with reference to time intervals.
Answer
A bus in traffic covers different distances in equal time intervals due to varying speeds caused by congestion. Example: In 5 minutes it might travel 100 m (heavy traffic) but 2 km when road is clear …
An object travels 16 m in 4 seconds, then 16 m in 2 seconds. What is the average speed?
Answer
Using the formula: Average Speed = Total Distance ÷ Total Time Total distance = 16 m + 16 m = 32 m Total time = 4 s + 2 s = 6 s Average Speed = 32 m ÷ 6 s = 5.33 m/s Note: Average speed is calculated …
Lightning is seen, and thunder is heard 5 seconds later. If sound travels at 346 m/s, how far away is the lightning?
Answer
Using: Distance = Speed × Time Distance = 346 m/s × 5 s = 1730 m (approximately 1.73 km) Explanation: Light from lightning reaches us almost instantly, but sound takes time to travel. The 5-second del…
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