Motion - NCERT Numericals (Part 2) | Class 9 Physics

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✅ In this video,

✔️ Class: 9
✔️ Subject: Physics
✔️ Chapter: Motion
✔️ Topic Name: NCERT Numericals (Part 2)
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00:00 Introduction
00:53 Numericals Part 2: NCERT Questions
13:40 Websites Overview
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Points covered in this video:-
Numericals Part 2: NCERT Questions
Question 1. Distinguish between speed and velocity.
Solution:

Speed                                                                     Velocity
The rate of change of distance          The rate of change of displacement
Scalar quantity                                              Vector quantity
SI unit = ms-1                                                    SI unit = ms-1

Question 2. Under what condition(s) is the magnitude of average velocity of an object equal to its average speed?
Solution: Only when the object moves along a straight line path.

Question 3. What does the odometer of an automobile measure?
Solution: It measures distance travelled by the vehicle.

Question 4. What does the path of an object look like when it is in uniform motion?
Solution: Uniform motion = Equal distances covered in equal intervals of time.
    ∴ Speed is constant
As long as speed is constant the path of an object in uniform motion can have any shape.

Question 5. During an experiment, a signal from a spaceship reached the ground station in five minutes. What was the distance of the spaceship from the ground station? The signal travels at the speed of light, that is, 3 × 108 m s-1.
Solution:


Distance = Speed x Time
        = 3 x 108 m/s x 5 min
        = 3 x 108 m/s x 300
        = 9 x 108 m .

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