हिंदी

Define work.

Advertisements
Advertisements

प्रश्न

Define work.

Define the term work

परिभाषा
Advertisements

उत्तर

The work done by a force on a body is equal to the product of the force applied and the distance moved by the body in the direction of force i.e.,

Work done = Force × distance moved in the direction of force

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 3: Work and Energy - Evaluation [पृष्ठ ११२]

APPEARS IN

सामाचीर कलवी Science - Term 1 [English] Class 4 TN Board
अध्याय 3 Work and Energy
Evaluation | Q V. 5. | पृष्ठ ११२
एस.एस. शोम Concise Physics [English] Class 8 ICSE
अध्याय 4 Energy
Short/Long Answer questions | Q 1 | पृष्ठ ७७
सेलिना Concise Physics [English] Class 10 ICSE
अध्याय 2 Work, Energy and Power
EXERCISE - 2(A) | Q 1. a. | पृष्ठ २७
फ्रैंक Physics Part 2 [English] Class 10 ICSE
अध्याय 1 Force, Work, Energy and Power
Exercises (Cumulative Revision) | Q 41. (a) | पृष्ठ ८७
लखमीर सिंग Physics [English] Class 10 ICSE
अध्याय 2 Work, Power and Energy
Intex Question | Q 1. 1. | पृष्ठ २७
लखमीर सिंग Physics Part 1 [English] Class 9
अध्याय 4 Work and energy
Very Short Answers 1 | Q 52.1.1 | पृष्ठ १४७

संबंधित प्रश्न

In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.


Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?


An electron emitter must have _____________ work function and ___________ melting point.


The S.I. unit of energy is .............


The moon is revolving around the earth in a circular path. How much work is done by the moon?


Write the expression for work done by a force.


Define the term energy.


What are the two kinds of mechanical energy?


Give reasons for the following A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work.


What is the condition for a force to do work on a body?


Fill in the blank with suitable word :
1 joule is the work done when a force of 1 __________ moves an object through a distance of one __________ in the direction of __________.


A car is being driven by a force of 2.5 ✕ 1010 N. Travelling at a constant speed of 5 m/s, it takes 2 minutes to reach a certain place. Calculate the work done.


Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.


Its moment of a force scalar or a vector quantity?


What is the relationship between Nm and dyne cm?


Give two examples of couple actions in our daily life.


A man lifts a mass of 10 kg from the floor to a shelf 4 meter high. If g = 10 ms-2, what is the work done?


What is the work done on a body by the gravitational force towards the centre of the path acting when it moves along a circular path?

Complete the following sentences:
 Joule is the unit of .......


Can work done be zero even if force acts on the body?


What are the factors on which P.E. of a body depends?

What is the amount of energy spent in lifting 1 kg through 1 m? Take g = 10 ms-2.

Give two examples of P.E.

What is the amount of energy spent by the heart in pumping blood through the body?

A cricket ball is thrown up from the earth's surface. What happens to its P.E.
(a)    during the motion
(b)    at the highest point?


Name the physical quantity associated with the 'rate of doing work'.


An electric motor drives a machine which lifts a mass of 4 kg through a height of 10 m in 5 s at a constant speed. Assuming g = 10 ms-2, calculate

(i) the amount of work done,    (ii) the power of the machine.


A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a)    Calculate the work done by the force in moving the block from A and B.
(b)    Calculate the potential energy gained by the block.


A bullet is of mass 'm' g and is moving with a velocity 'v' m/s. Find the kinetic energy of the bullet when
(a) The mass is doubled,
(b) The velocity is tripled.


State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.


State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.


A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.


Define Translational motion.


Explain, why submarines are able to dive underwater as well as a sail on the surface of the water?


(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?


An electric motor of power 100 W is used to drive the stirrer in a water bath. If 50% of the energy supplied to the motor is spent in stirring the water. Calculate the work done on the water in one minute.


Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.

Food grains are getting dried in the sun.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×