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Motion Numericals Class 9 Extra Motion Numericals from S Chand Motion important Numericals Physics

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 Class - 9
Motion Numericals
Source : S Chand Book

Short Answer Type Questions

1. Is displacement a scalar quantity?

2. State whether distance is a scalar or a vector quantity.
3. Change the speed of 6 m/s into km/h.
4. What name is given to the speed in a specified direction?
5. Give two examples of bodies having non-uniform motion.
 6. Name the physical quantity obtained by dividing 'Distance travelled' by 'Time taken' to travel that distance.
7. What do the following measure in a car? (a) Speedometer (b) Odometer
 
8. Name the physical quantity which gives us an idea of how slow or fast a body is moving.
9. Under what conditions can a body travel a certain distance and yet its resultant displacement be zero ?
10. In addition to speed, what else should we know to predict the position of a moving body ?
11. When is a body said to have uniform velocity ?
12. Under which condition is the magnitude of average velocity equal to average speed ?
13. Which of the two can be zero under certain conditions : average speed of a moving body or average velocity of a moving body ?
14. Give one example of a situation in which a body has a certain average speed but its average velocity is zero.
15. What is the acceleration of a body moving with uniform velocity ?
16. What is the other name of negative acceleration ?
17. Name the physical quantity whose SI unit is : (a) m/s (13) m/s2
18. What type of motion is exhibited by a freely falling body ?
19. What is the SI unit of retardation ?
20. Fill in the following blanks with suitable words :
(a) Displacement is a ……………. quantity whereas distance is a ……………. quantity.
(b) The physical quantity which gives both, the speed and direction of motion of a body is its ………………
(c) A motorcycle has a steady ……………… of 3 m/s2. This means that every …………….. its ……………. Increases by ………………..
(d) Velocity is the rate of change of ………………. It is measured in ……………….

(e) Acceleration is the rate of change of ……………….. It is measured in ……………….


ANSWERS

3. 21.6 km/h 6. Speed 8. Speed 9. When the body comes back to its starting point 10. Direction of speed 12. When the body moves along a straight line path 13. Average velocity 15. Zero (0) 16. Retardation (or Deceleration) 17. (a) Speed (or Velocity) (b) Acceleration 20. (a) vector ; scalar (b) velocity (c) acceleration ; second ; speed (or velocity) ; 3 m/s (d) displacement ; m/s (e) velocity ; m/s2


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