English

Write an expression for the work done when a force is acting on an object in the direction of its displacement. - Science

Advertisements
Advertisements

Question

Write an expression for the work done when a force is acting on an object in the direction of its displacement.

Short Answer

Solution

When a force F displaces a body through a distance S in the direction of the applied force, then the work done W on the body is given by the expression:

Work done = Force × Displacement

W = F × s

shaalaa.com
  Is there an error in this question or solution?
Chapter 11: Work and Energy - Intext Questions [Page 149]

APPEARS IN

NCERT Science [English] Class 9
Chapter 11 Work and Energy
Intext Questions | Q 2 | Page 149

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

Work is said to be done by a forte only when ................


A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:

  1. the work done, and
  2. the power developed by them. Take g = 10 N kg-1.

Is work a scalar or a vector quantity?


What is the work done against gravity when a body is moved horizontally along a frictionless surface?


What are the quantities on which the amount of work done depends? How are they related to work?


What is the relationship between Nm and dyne cm?


Draw a neat labeled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point about which rotation takes place.


P, Q and R are three forces which act as shown in fig.

The point O lies in the same plane. Given, P = Q = R = 10N

(i) Which force has the least moment about O? Give a reason.

(ii)Which force has the greatest moment about O? Give a reason.


A boy does work when he pushes against a brick wall. (yes/no).


Write an expression for work done by a force depends?


What are the physical parameters on which the kinetic energy of a body depends?

Name the type of energy possessed by a moving bullet.

A body of mass 2 kg is moving with a speed of 20 ms-1. What is its K.E.?

Name the practical unit of power.

A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.


Define the term work. Name the CGS and SI unit of work.


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.


The weights of two bodies are 2.0 N and 2.0 kgf respectively what is the mass of each body?


A ______ should act on an object.


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

An engine is pulling a train.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×