Class 9 Motion Link:
Watch the lecture on motion
Assignment
1
Chapter :
Motion
1. What is meant by the statement ‘Rest and motion are relative terms’? Give
example to show it.
2.
Explain whether the walls of a classroom are at
rest or in motion.
3.
Define scalar and vector quantities.
4. 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 says 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 covers a distance of 5 km in
20 mins. Find the velocity
of the car in (a) km/min
(b) m/s (c) m/min (d) km/hr.
10. a train is
moving with a velocity of 45km/hr. calculate the
distance traveled by it in 1
hr, 1 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?
(ii) When do you say that an
object has negative acceleration?
14. State
which of the following situations are
possible and give an example of
each of these:-
(a) A
body moving with constant acceleration but with
zero velocity.
(b)
A body moving horizontally with acceleration in
vertical direction.
(c) A
body moving with a constant speed in an
accelerated motion.
15.
What is a
reference point?
16. Name the 2
physical quantities which can be obtained
from velocity-time graph.
17. An
electric train is moving with a
velocity of 120km/hr. how much distance will it cover
in 30 sec?
18.
Give differences between linear motion and circular motion.
19. Velocity
time graph of a body is shown in the
figure. What are initial and final velocities of
the body?
20. A body
moves around the sun with constant speed in circular path. Is the motion of the body
uniform or accelerated?
21.
Name the physical quantity which remains
constant during uniform circular motion.
22. Name the
physical quantity which changes during uniform circular motion.
23. An object has moved through a distance. Can it have
zero displacement? Support
your
answer with an example.
24. A physical
quantity is measured – 10m/s. is it speed or velocity?
25. A car is moving
with a uniform velocity of 10m/s. the driver of the car decides to overtake the bus moving ahead of the car. So the driver of the car accelerates
at 1m/s2 for 10 sec. Find the velocity of the car at the end of 10 sec. also find the distance traveled by the car while accelerating.
Note :
Submit the answered work sheet by March 30, 2020, to
respective email address given below.
Classes 9A1, 9A2 to physics1dps@gmail.com
Classes 9A3, 9A4 to physics2dps@gmail.com
Classes 9A5, 9A6, 9A7 to physics 3dps@gmail.com
Where are we supposed to write the answers
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