Plot the v - t graph for the following data and state the nature of motion of the body: v m / s 0 5 8 12 18 25 30 35 40 45 t s 2 4 6 8 10 12 14 16 18 20

The v - t graph for the given data is as under: From the graph, it is clear that the body is having non-uniform motion. Its velocity is not constant but increasing over time. Initial its acceleration was non-uniform but later from 12 s onwards the body is having uniform acceleration.

Instruction: The table given below shows distance (in cm ) travelled by the bodies A, B and C. Read this data carefully and answer the question which follow. Distance (in cm ) covered by different bodies Time Body A Body B Body C 1 st second 20 20 20 2 nd second 20 36 60 3 rd second 20 24 100 4 th second 20 30 140 5 th second 20 48 180 Which of the bodies is moving with constant speed?

Among the three bodies, the body A is moving with constant speed as the distance covered by it is 20 cm each second which is the same throughout the time considered.

E M B I B E

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 30

EASY

9th CBSE

IMPORTANT

Earn 100

Define average speed.

Important Questions on Motion

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 31

Give SI unit of angular velocity.

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 32

Give two uses of graphical representation of motion.

MEDIUM

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 33

Plot the $v - t$ graph for the following data and state the nature of motion of the body:

$v (m / s)$	$0$	$5$	$8$	$12$	$18$	$25$	$30$	$35$	$40$	$45$
$t (s)$	$2$	$4$	$6$	$8$	$10$	$12$	$14$	$16$	$18$	$20$

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 34

A car accelerates from

6 m s^{- 1}

to

16 m s^{- 1}

in

10 s

. Calculate (a) the acceleration and (b) the distance covered by the car in that time.

MEDIUM

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 35

A circular track has a circumference of

3140 m

with AB as one of its diameter. A scooterist moves from A to B along the circular path with a uniform speed of

10 m / s

. Find
(a) distance covered by the scooterist,
(b) displacement of the scooterist and
(c) time taken by the scooterist in reaching from A to B.

MEDIUM

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 36

Define acceleration and state its SI unit. For motion along a straight line, when do we consider the acceleration to be (i) positive (ii) negative? Give an example of a body in uniform acceleration.

MEDIUM

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 37

Find the total displacement of the body from the following graph:

Question Image

EASY

9th CBSE

IMPORTANT

Together with Science Class 9>Chapter 8 - Motion>ASSESS YOURSELF>Q 38

Instruction: The table given below shows distance (in $cm$ ) travelled by the bodies A, B and C.

Read this data carefully and answer the question which follow.

Distance (in $cm$ ) covered by different bodies

Time	Body A	Body B	Body C
$1^{st}$ second	$20$	$20$	$20$
$2^{nd}$ second	$20$	$36$	$60$
$3^{rd}$ second	$20$	$24$	$100$
$4^{th}$ second	$20$	$30$	$140$
$5^{th}$ second	$20$	$48$	$180$

Which of the bodies is moving with constant speed?

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