Motion
Telangana Board · Class 9 · Physical Science
Flashcards for Motion — Telangana Board Class 9 Physical Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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A car travels 300 km from Delhi to Agra in 4 hours, then returns to Delhi in 5 hours. What is the car's average speed for the entire journey?
Answer
Total distance = 300 + 300 = 600 km Total time = 4 + 5 = 9 hours Average speed = Total distance ÷ Total time = 600 ÷ 9 = 66.67 km/h Note: Average velocity = 0 (since displacement is zero)…
Why do passengers in a bus lean backward when the bus suddenly starts moving?
Answer
Due to inertia - the tendency of objects to resist change in motion. When the bus accelerates forward, passengers' bodies tend to remain at rest due to inertia, causing them to lean backward relative …
What is the difference between distance and displacement? Give an example.
Answer
Distance is the total path length traveled (scalar). Displacement is the shortest distance between initial and final positions with direction (vector). Example: If you walk 50m east, then 30m west: Di…
A stone is thrown vertically upward with initial velocity 20 m/s. How long does it take to reach maximum height? (Take g = 10 m/s²)
Answer
At maximum height, final velocity v = 0 Using v = u + at: 0 = 20 + (-10)t -20 = -10t t = 2 seconds The stone takes 2 seconds to reach maximum height.
How do you determine if motion is uniform or non-uniform?
Answer
Uniform motion: Velocity remains constant (equal distances covered in equal time intervals). Distance-time graph is a straight line. Non-uniform motion: Velocity changes (unequal distances in equal ti…
What happens when you release a stone tied to a string while whirling it in a circle?
Answer
The stone moves in a straight line along the tangent to the circle at the point of release. This demonstrates that: 1. Velocity direction is tangent to the curved path 2. Objects in circular motion ha…
A train starts from rest and reaches 72 km/h in 10 seconds. What is its acceleration?
Answer
Initial velocity u = 0 Final velocity v = 72 km/h = 72 × 5/18 = 20 m/s Time t = 10 s Using v = u + at: 20 = 0 + a × 10 a = 20/10 = 2 m/s² The train's acceleration is 2 m/s²…
Why is motion called 'relative'? Give a practical example.
Answer
Motion depends on the observer's reference frame. The same object can appear moving to one observer and stationary to another. Example: A passenger in a moving train appears stationary to another pass…
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