IX--CLASS--PHYSICS--VIDEO LINK (MOTION)

Kindly visit the following link.

Its a video series, which is covering various topic on MOTION.

It enhance your understanding about MOTION.

https://www.youtube.com/watch?v=F-WGuMkT79g&list=PLNmVaiMnCArU6pp8gM53XYOt6AZVq1cHK

IX--CLASS--PHYSICS WORKSHEET 1

ARMY PUBLIC SCHOOL, GOLCONDA

Class 9 – Physics - Ch 8 – Motion

(WORKSHEET - 1)

Subtopic –

1.) INTRODUCTION ON MOTION & REST

2.) DESCRIBING MOTION—distance & displacement

Fill in the blanks

1. If the position of an object does not change with time, it is said to be at _____.

2. Rest and Motion are ___________ (absolute/relative) terms

3. The study of motion without taking into account the cause of motion is called ______ (kinematics/dynamics).

4. An object is said to be at ________ (rest/motion), if it changes its position with respect to its surroundings in a given time

5. Distance is the length of ______(actual/shortest) path traveled by a body in a given time.

6. Displacement is the ______ (actual/shortest) path covered by a moving object from the initial point of reference in a specified direction.

7. Distance is a _______ (scalar/vector) physical quantity while displacement is a _______ (scalar/vector) physical quantity. 

8. SI unit of distance is _____ (meter / kilometer)

9. SI unit of displacement is _____ (meter / kilometer).

10. Movement of dust and the movement of leaves, infer the motion of air _____    (directly / indirectly).

MCQs

1.  A scalar quantity has ______________?

(a) Magnitude only
(b) direction only
(c) both direction and magnitude
(d) none of these.

2.  A vector quantity has ______________?

(a) Magnitude only
(b) direction only
(c) both direction and magnitude
(d) none of these.

3.  The SI unit of displacement is-

(a) m
(b) km
(c) cm
(d) am

4.  If a body travelled to some path then its distance-

(a) can be positive
(b) can be zero
(c) can be negative
(d) all are true.

5.  If a body travelled to some path then its displacement -

(a) can be positive
(b) can be zero
(c) can be negative
(d) all are true.

6.  Distance is always ≥ displacement -

(a) true
(b) false
(c) both (a) and (b)
(d) neither (a) nor (b).

7.  A scalar quantity-

(a) distance
(b) displacement
(c) both (a) and (b)
(d) neither (a) nor (b).

8.  A vector quantity-

(a) distance
(b) displacement
(c) both (a) and (b)
(d) neither (a) nor (b).

9.  In the given figure, object starts its motion at point A,GO TO B-C-D  and again came back to A. find DISTANCE at point A.

(a) 0
(b) 16
(c) can’t say
(d) 8

10.     In the given figure, object starts its motion at point A,GO TO B-C-D  and again came back to A. find DISPLACEMENT at point A.

(a) 0
(b) 16
(c) can’t say
(d) 8

Q & A’s

1.  What do you mean by a body in motion or at rest?

2. Are motion and rest absolute and relative? Explain with example.

3. What does the odometer of an automobile measures?

4. Give 2 situations where the motion is inferred through “direct evidences” and “indirect evidences”.

5. What do you mean by “reference point”.

6. Differentiate between “distance” and “displacement”.

7.  If the displacement of a body is zero, is the distance by it is also zero? Comment.

8.  Is the magnitude of the displacement and distance of an object can be equal? Justify.

9.  Show that displacement of a body is either smaller or equal to the distance of the body.

10.   Chancy drives her scooter 7 kilometers north.  She stops for lunch and then drives 5 kilometers east.  What distance did she cover?  What was her displacement?

Solve the following

1. In figure-

John walks from the point A to B to C. What does the distance he travels? What is the displacement?

2. Bessie the fox and Sally the rabbit both traveled from point “A” to point “B.” Sally traveled in a straight line and Bessie did not.

A. What distance does Bessie the fox travel?

B. What distance does Sally the rabbit travel?

C. What is Bessie the fox’s displacement?

D. What is Sally the rabbit’s displacement?

3.  

The track is 100 meter around.

a.) If the car travels once around the racetrack, what distance does it travel?

b.) If the car travels twice around the racetrack, what distance does it travel?

c.) If the car travels once around the racetrack, what is its displacement?

4. An athlete completes one round of a circular path of diameter 200 m in 40 seconds. What will be the distance covered and displacement at the end of 2 min 20 seconds?

5. What are the distance and the displacement of the race car drivers in completing path of length 500 m?

6. Anthony walks to the pizza place for lunch.  He walk 1 km east, then 1 km south and then 1 km east again.  What distance did he cover?  What was his displacement?

7. A particle moves along a circle of radius ‘R’. it starts  from A and moves in antilock direction. Calculate the distance travelled by particle

(a) From A to B                                      (b) From A to C

 (c) From A to D                                     (d) for complete 2 rounds.

 8. A car moves 100 m due east and then 25 m due west, (a) What is the distance

Covered by the car? (b) What is its displacement?

9. What is the displacement of the cross-country team if they begin at the school, run 10 miles and finish back at the school?

10. Look at the picture given below. An object moves from point A through B, C, D, E. and stops at point F.

a) Find final displacement

b)Find distance taken from point A to D.

IX--CLASS--PHYSICS WORKSHEET 2

ARMY PUBLIC SCHOOL, GOLCONDA

Class 9 – Physics - Ch 8 – Motion

(WORKSHEET - 2)

Subtopic –

·       UNIFORM & NON-UNIFORM MOTION.

·       Graphical representation of DISTANCE-TIME

Fill in the blanks

1. The motion of the earth around the sun is ___________ (uniform /non-uniform).

2. When a stone falls from a height, its motion is ___________ (uniform /non-uniform).

3. A car travels 10 km in every 5 minutes; its motion is ___________ (uniform /non-uniform).

4. In ___________ (uniform /non-uniform) motion, object travels with uniform speed/velocity.

5. In the story of hare-tortoise, motion followed by rabbit is ___________ (uniform /non-uniform).

6. In ___________ (uniform /non-uniform) motion, object travels with variable speed/velocity.

7. In uniform motion, distance.-time graph is a ___________ (straight /curved) line.

8. In non-uniform motion, distance.-time graph is a ___________ (straight /curved) line.

9. In uniform motion, slope of distance.-time graph is nothing but ___________ (speed /distance).

10. In distance.-time graph time is represented on ___________ (horizontal /vertical) axis and distance is represented on ___________ (horizontal /vertical) axis.

MCQs

1.  If the time-displacement graph of a particle is along X-axis, the velocity of particle is-

(a) unit value                                                                                 (b) zero

                 (c) infinite                                                                                      (d) none of these.

2.  Which of the Following time-displacement graph does not present a real situation-

(a)                       (c) 

     

 (b) 

                     (d)

 

 

3.  The given time-displacement graph shows that body is at-

                   (a) rest                                                                                 (b) non-uniform motio

                   (c) uniform motion                                                           (d) none of these

4.  In the given time-displacement graph the distance covered by body B in 2 seconds-

(a) 100                                                                                     (b) 200

(c) 50                                                                                       (d) 150

5.  In the given time-displacement graph the distance covered by body A in 2 seconds-

(a) 100                                                                                     (b) 200

(c) 50                                                                                       (d) 150

Q & A’s

1.  Define uniform motion with example.

2.  Define non-uniform motion with example.

3. Distinguish between uniform and non-uniform motion.

4. What are the uses of graphical study of motion?

5. What is the nature of the distance-time graph for uniform and non-uniform motion of an object?

6. What can you say about the motion of an object whose distance-time graph is a straight line parallel to the time axis?

7. Show that the distance-time graph gives speed/ velocity of the body.

(Hint: find slope).

8. What does the path of an object look like on distance-time graph when it is in-

·         Uniform motion

·         Non-uniform motion

·         Rest or a stationary body

9.  The following tables give data about motion of an automobile –

TIME (seconds)	9.00	9.30	10.00	10.30	11.00	11.30
DISTANCE ( meter)	0	30	30	45	60	100

·         Plot the distance-time graph

·         Is the automobile’s motion is an example of uniform or non-uniform motion?

10.         Plot distance-time graph of the given data. And calculate speed for each case.

A)    

Time (s)	0	1	2	3	4	5	6
Distance(m)	0	10	20	30	40	50	60

        

B)  

Time (s)	0	1	2	3	4	5	6
Distance(m)	0	8	16	24	32	40	48

        

11.         The following data gives the displacement of body at various instant of time.

  

Time (s)	0	1	2	3	4	5	6
Distance(m)	2	4	6	8	10	12	14

        

·         Calculate velocity.

·         Calculate distance travelled in first 4 seconds?

·         Calculate distance travelled in last 4 seconds?

12.         If the body is at rest then the path followed by it on distance-time graph will be given by which line (A or B)? Why is it so, explain.

13.         Name two quantities, the slope of whose graphs gives “speed”. Show graph as well.

14.         The distance-time graph of two trains is given here. The train starts simultaneously in the same direction.

·   How much ahead of A is B when the motion starts?

·   What is speed of A and B?

·   When and where A will catch B?

·   Is the motion of both trains – uniform or non-uniform? Justify your answer.

15.         The given figure gives the distance-time graph of three objects A, B and C. Study the graph and answers the following questions.

·   Which of the three is travelling the fastest

·   Are all three ever at the same point on the road?

·   How far has C travelled when B passes A?

·   How far has B travelled by the time it passes C?