" /> -->

#### Motion Model Question Paper

9th Standard

Reg.No. :
•
•
•
•
•
•

Science

Time : 01:00:00 Hrs
Total Marks : 40
5 x 1 = 5
1. The area under velocity time graph represents

(a)

Velocity of the moving object

(b)

Displacement covered by the moving object

(c)

Speed of the moving object

2. When a body starts from rest, the acceleration of the body after 2second in _____________ of its displacement

(a)

Half

(b)

Twice

(c)

Four times

(d)

One fourth

3. Force involved in uniform circular motion is given by _______________

(a)

f = mv2/r

(b)

f = mvr

(c)

f= mr2/v

(d)

f = v2/r

4. The hands of the clock, the spokes of wheel are example of _______

(a)

linear motion

(b)

circular motion

(c)

oscillatory motion

(d)

revolutionary motion

5. In which direction of the motion of the particles does centripetal force act?

(a)

parallel

(b)

(c)

tangential

(d)

perpendicular

6. 5 x 2 = 10
7. What is centripetal force?

8. What is centrifugal force?

9. Give two examples for centrifugal force.

10. How is washing machine wash the clothes?

11. A student takes 15 minutes to travel from his home to school with a uniform speed of 5km/h. What is the distance of his school form the home?

12. 5 x 3 = 15
13. A motorcycle travelling at 20ms-1 has an acceleration of 4ms-2. What does it explains about the velocity of the motorcycle.

14. Complete of following sentences
a. The acceleration of the body that moves with a uniform velocity will be ________
b. A train travels from A to station B with a velocity of 100 km/h and returns from station B to station A with a velocity of 80km/h. Its average velocity during the whole journey in ______________ and its average speed is ____________

15. What is meant by negative acceleration?

16. A car moving along a straight line covers a distance of 1 km towards the east in 100s. Find the (i) speed of the car. (ii) the velocity of the car.

17. The diagram shows the position of a ball a it rolls down a track - the ball took 0.5s sec to roll from one position to other.
(a) State where the motion of the ball is uniform or non-uniform motion.
(b) What is the distance travelled by the ball in 2.5 s?
(c) Find the average velocity of the ball from. A to F.

18. 2 x 5 = 10
19. The following graph shows the motion of a car. What do you infer from the graph along OA and AB? What is the speed of the car along AB and what time it reached this speed.

20. Derive the three equations of motion by graphical method