Advertisements
Advertisements
प्रश्न
State the condition when the work done by a force is negative. Explain with the help of examples.
Advertisements
उत्तर
If the displacement of the body is in the direction opposite to the force, then the work done is negative.
Hence, W = - F × S
For example, when a body moves on a surface, the force of friction between the body and the surface is in a direction opposite to the motion of the body, and so the work done by the force of friction is negative.
APPEARS IN
संबंधित प्रश्न
How is work done by a force measured when the force is in the direction of displacement?
Draw a simplified diagram of a lemon crusher, indicting of load and effort
A body is moved in a direction opposite to the direction of force acting on it. State whether the work is done by the force or work is done against the force
The work done by a fielder when he takes a catch in a cricket match, is negative. Explain.
A body, when acted upon by a force of 10 kgf, gets displaced by 0.5 m. Calculate the work done by the force, when the displacement is (i) in the direction of force, (ii) at an angle of 60° with the force, and (iii) normal to the force. (g = 10 N kg-1)
Name the quality which is measured in Wh.
What is the work done by the gravitational force on the moon that revolves around the earth?
In the following case write yes, if the work is being done and no if no work is being done.
A man moving on the rough ground.
What is the S.I. unit of work? Define it.
