MAHATMA MONTESSORI SCHOOL
(Affiliated to Central Board of Secondary Education, New Delhi)
STD : IX
PHYSICS
MARKS: 50
CH. 8 MOTION
OPEN BOOK TEST (OBT)
SECTION A
I VERY SHORT ANSWER QUESTIONS
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
15 X 1 = 15
What is the acceleration of a body moving with uniform velocity?
In what ways the velocity of the body can be changed?
A body goes from point A to B and then return them from B to A, what is the total displacement?
and
are used to describe the overall motion of an object and to locate
its final position with reference to its initial position at a given time.
A body falls freely. What is constant?
What is the numerical ratio of average velocity to average speed of an object moving along a
straight line path?
The first equation of motion is
.
A body stops after some time. What is zero?
If a body moves with a constant velocity then velocity time graph for this body would be
parallel to time axis.
A racing car has uniform acceleration of 8 m/s2. What distance will it cover in 5 seconds after the
start?
Name the quantity represents the rate of change of velocity?
If acceleration is in the
of the velocity then it is positive acceleration and if it is
in the opposite to the
of velocity then it is negative and negative acceleration
is termed as retardation.
Which remains constant in uniform circular motion?
Motion of earth around sun is an example of
motion.
What is represented by the area under velocity –time graph of a body?
SECTION B
II SHORT ANSWER QUESTIONS
10 X 2 = 20
16. What do you infer if
a) Distance-time graph is straight line
b) Velocity- time graph is curved
c) Displacement –time graph is zig zag.
17. A ball is thrown upwards and it goes to the height 100 m and comes down
1) What is the net displacement?
2) What is the net distance?
18. The velocity –time graph of an object is given below. What is the distance travelled by the object is
first 2 seconds?
19. Write down the differences between speed and velocity.
20. A car moves in a straight line from rest at t=0. It accelerates with 2m/s2. Solve the following table
Time
2s
?
Displacement
Velocity
?
?
25 m
?
21. A) Under what condition(s) is the magnitude of average velocity of an object equal to its average
speed?
B) What is the nature of the distance time graphs for uniform and non-uniform motion of an
object?
22. When an object is thrown upwards, what is the value of velocity and acceleration at the highest
point of motion of an object?
23. Define Average speed.
24. Study the speed time graph. Find the following questions based on the graph
a) Which path(s) have constant speed.
b) When is the maximum speed reached.
c) When is the acceleration happened.
d) When is the deceleration happened.
25. An object travels 45 m in 2 s and then another 60 m in 3 s. What is the average speed of the
object?