Describing Motion Around Us — Class 9 Science NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 9 Science chapter "Describing Motion Around Us" — 8 important questions with detailed answers for CBSE board exam preparation.
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TL;DR: Free step-by-step NCERT solutions for Class 9 Science chapter "Describing Motion Around Us" — 8 important questions with detailed answers for CBSE boa…
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Key Questions Covered:
- Define distance and displacement.
- A car travels 5 km east, then 3 km west. Find distance and displacement.
- Define speed and velocity.
- A cyclist covers 60 m in 5 seconds. Calculate speed.
- Define acceleration and write its formula.
- A car accelerates from 0 m/s to 20 m/s in 4 seconds. Find acceleration.
- + 2 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| Define distance and displacement. | ✓ Solved |
| A car travels 5 km east, then 3 km west. Find distance an… | ✓ Solved |
| Define speed and velocity. | ✓ Solved |
| A cyclist covers 60 m in 5 seconds. Calculate speed. | ✓ Solved |
| Define acceleration and write its formula. | ✓ Solved |
| A car accelerates from 0 m/s to 20 m/s in 4 seconds. Find… | ✓ Solved |
Showing 6 of 8 questions
Q1: Define distance and displacement.
Distance is the total path length traveled by an object (scalar quantity, always positive).
Displacement is the straight-line distance between starting and ending positions with direction (vector quantity, can be positive or negative).
Q2: A car travels 5 km east, then 3 km west. Find distance and displacement.
Distance = 5 + 3 = 8 km
Displacement = 5 - 3 = 2 km (east)
Note: Distance is always ≥ magnitude of displacement.
Q3: Define speed and velocity.
Speed = total distance / total time (scalar, always positive)
Velocity = displacement / time with direction (vector)
Formula: v = s/t
Unit: m/s
Q4: A cyclist covers 60 m in 5 seconds. Calculate speed.
Speed = Distance / Time = 60 m / 5 s = 12 m/s
Q5: Define acceleration and write its formula.
Acceleration is the rate of change of velocity with time.
Formula: a = (v - u) / t
Where u = initial velocity, v = final velocity, t = time
Unit: m/s²
Q6: A car accelerates from 0 m/s to 20 m/s in 4 seconds. Find acceleration.
Step 1: u = 0 m/s, v = 20 m/s, t = 4 s
Step 2: a = (v - u) / t = (20 - 0) / 4 = 5 m/s²
Showing 6 of 8 questions. Visit the full page for complete solutions.
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