Class : IX
Subject: Physics Assignment 1 Chapter: Motion
X. What is meant by the statement Rest and motion are relative terms? Give example to show
2. Explain whether the walls of a classroom are at rest or in motion
A Define scalar and vector quantities.
Identify the following as scalar or vector quantities - mass, velocity, speed, length, distance
displacement, temperature, force, weight power, work and energy.
5. The school of a boy from his home is 1 km to the east. When he reaches back home, he say
that he had traveled 2 km distance but his displacement is zero. Justify your answer.
6. Under what condition, the average speed is equal to the magnitude of the average velocity
7. Can the average speed of a moving body be zero?
8. Can the average velocity of a moving body be zero' State eamples.
9. A car cover a distance of 5 km in 20 mins Find the velocity of the car in (a) km min
(b
ms (c) m min id) km hr
10. a train is moving with a velocity of 45kın hr. calculate the distance traveled by it in 1 hr.
min 1 second
11. An object P is moving with a constant velocity for 5 mins Another object Q is moving with
changing velocity for 5 mins. Out of these two objects, which one has acceleration 'Explain
12. Can an object be accelerated if it is moving with constant speed? If yes, explain giving
examples
13. (i) When do you say that an object has positive acceleration?
Wohnhauveler
Answers
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1.
MOTION :- a body is said to be in motion if its position changes continuosly with respect to time and object taken as reference point .
Example:- When train is moving, when someone is walking,etc..
REST :- a body is said to be in rest when its position does not changes continuosly with respect to time and object taken as reference point.
Example:-When a book is store in libarary, any stationary obeject, etc...
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