Motion — Flashcards
Karnataka Board · Class 9 · Science
20 flashcards for Motion (Karnataka Board Class 9 Science) to test yourself on key terms and facts. Sample: "A car travels 100 km north, then 60 km south."
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A car travels 100 km north, then 60 km south. What is the total distance and displacement?
Answer
Distance = 100 km + 60 km = 160 km (total path length) Displacement = 100 km - 60 km = 40 km north (shortest distance from start to end position)…
Why can displacement be zero while distance is non-zero?
Answer
Displacement is the shortest distance from initial to final position. If an object returns to its starting point, displacement = 0, but it has traveled a certain path length (distance > 0). Example: R…
A train covers 180 km in 3 hours. Calculate its average speed in m/s.
Answer
Average speed = Total distance / Total time = 180 km / 3 h = 60 km/h Converting to m/s: 60 × (1000/3600) = 60 × (5/18) = 16.67 m/s…
What is the difference between speed and velocity?
Answer
Speed is distance traveled per unit time (scalar - only magnitude). Velocity is displacement per unit time (vector - has both magnitude and direction). Example: A car moving at 50 km/h eastward has sp…
A cyclist accelerates from rest to 15 m/s in 5 seconds. Calculate acceleration.
Answer
Acceleration = (Final velocity - Initial velocity) / Time a = (v - u) / t = (15 - 0) / 5 = 3 m/s² The cyclist's velocity increases by 3 m/s every second.
Why do we feel pushed backward when a bus suddenly accelerates forward?
Answer
Due to inertia - our body tends to remain at rest while the bus accelerates forward. This creates a relative backward motion, making us feel pushed back against the seat. This demonstrates Newton's fi…
What does uniform motion mean? Give an example.
Answer
Uniform motion occurs when an object covers equal distances in equal intervals of time, maintaining constant speed. Example: A car moving at steady 60 km/h on a straight highway, covering 1 km every m…
How do you measure the speed of a moving car using distance-time graph?
Answer
Speed = slope of distance-time graph. Draw a triangle on the graph: horizontal side = time interval, vertical side = distance traveled. Speed = vertical side / horizontal side. Steeper slope = higher …
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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