Physics Topic2 Mechanics Power

before topic work continued…

1. A girl whose weight is 200N, climbs on a tree which night is 2 m. what was the work done by the girl after climbing the tree? (g=10m/s2)

 
 
 
 

2. If someone travels 15km distance with a fixed force of 500N, then calculate the work done will be

 
 
 
 

3. Which of the following has magnitude and no direction

 
 
 
 

4. A horizontal force of 10N displaces an object of 5kg to a distance of 2m in the direction of the force. what will be the work done by the object?

 
 
 
 

5. What is the amount of work done when an object moves under a force of 10 N at a distance of 10 m in the direction of force?

 
 
 
 

6. A force of 50N displaces an object in 10 m. what will be the work done by the force?

 
 
 
 

7. If an object not moving after applying a force, then we can say that

 
 
 
 

8. If the displacement of an object is zero. then work done by the applied force is

 
 
 
 

9. Which of the following is not a characteristic of work?

 
 
 
 

10. A bus runs with a force of 4000N. the work done by the bus is 2000J. what is the distance covered by the bus?

 
 
 
 

11. If a man pull a trolly by applying force of 50N and trolly is displaced 30m. what is work done?

 
 
 
 

12. A man puts 20kg object on his head by raising the object 2m above from the surface of earth. then work done will be

 
 
 
 

13. A man puts 13kg object on his head by raising the object 1.5m above from the surface of earth. then work done will be (g=10ms-2)

 
 
 
 

14. A boy hold 4 kg school bag for 30 seconds, the work done by him will be in joule

 
 
 
 

15. Work can only be done when are present

 
 
 
 

16. Which of the following is not an example of work done ?

 
 
 
 

17. When the direction of the force applied and the direction of movement of the object are perpendicular to each other

 
 
 
 

18. If the work done is negative, then what will be the angle between the force and displacement?

 
 
 
 

19. A force of 125 N is acting on an object, that object is moved up to 5 m in the direction of the force, what will be the work done by the force?

 
 
 
 

20. If an object is rotated in a circular path, what will be the work done on it ?

 
 
 
 

21. If a person pulls the trolly up to the distance of 10m with the force of 50N, what will be the work done by him?

 
 
 
 

22. When displacement occurs, the work done by the force is considered negative

 
 
 
 

 

 

ii) POWER

 

23. Rate of doing work is called ?

 
 
 
 

24. How is power interpreted?

 
 
 
 

25. What is working rate or energy transfer rate ?

 
 
 
 

26.If a man do W work in t time, then his power P will be

 
 
 
 

27. Power = W/T, What is the meaning of W ?

 
 
 
 

28. Rate of doing work is called ?

 
 
 
 

29. Which of the following physical quantity measure the rate of work ?

 
 
 
 

30.If two forces of 10N and 5N are applied in the same direction on an object, what will be the total force acting on the object?

 
 
 
 

31.Formula of power is

 
 
 
 

32. Which of the following physical quantity measures the rate of work done?

 
 
 
 

33. Mohan having a mass of 40kg he climb of 50 steps of a staircase in 10s. If the height of each step is 15cm then what is his power?(g=10m/s2 )

 
 
 
 

34. If a boy covers a distance of 20 meters with 600 Newton force in 4 minutes, then the amount of power consumed by the boy is?

 
 
 
 

35. A boy of 50kg mass climbs 40 stairs in 9 seconds. If the height of each stair is 15cm, then find his power.(g=10ms-2)

 
 
 
 

36. Name the physical quantity that is equal to the product of force and velocity

 
 
 
 

37. A 40kg girl quickly climbs up the stairs to 5m height in 4 sec, what will be the power developed by her ?

 
 
 
 

38. A boy of 50kg mass climbs 45 stairs in 10 seconds. If the height of each stair is 16 cm then find his power ?

 
 
 
 

39. The average power is equal to which of the following?

 
 
 
 

40. A boy of 50kg mass climbs 40 stairs in 10 seconds. If the height of each stair is 15cm, then calculate his power. (g=10ms-2)

 
 
 
 

41. A boy of 50kg mass climbs 45 stairs in 9 seconds. If the height of each stair is 15cm, then calculate his power.

(g= 10ms-2)

 
 
 
 

42. If a girl with a weight of 40N, climbs on the rope for 20 seconds with the power of 160 watts, then at which height will she reach ?

 
 
 
 

43. A boy of 50kg mass climbs 44 stairs in 10 seconds. If the height of each stair is 15cm then find his power?

 
 
 
 

44. If an agent doing ‘W’ works in time ‘t’, then his power will be

 
 
 
 

45. A boy of 50kg mass climbs 43 stairs in 10 seconds. If the height of each stair is 15cm then find its power?

 
 
 
 

46. A more powerful engine can do more work in less time like an aeroplane travel more distance as compare to a car in less time. so aeroplane is more powerfull than a car. it is an example of which of the following?

 
 
 
 

47. What will be the average power required to lift an object of 80kg to a height of 40 m in 50s ?(g=10ms-2)

 
 
 
 

48. Which of the following is the power’s formula?

 
 
 
 

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