Nature Of Work Done|Positive Work Done|Negative Work Done|Energy|Important Points|Summary

Nature Of The Work Done

Introduction to Work Done || Work Energy Theorem

Work Done By A Force

Work Done|Work Done By Friction|Work Done By Spring Force|Questions

When is work done by a force negative ?

Work Done -3( Work Done by Gravity || Work Done by Normal Reaction || Work Done by Friction )

When is the work done by gravity negative ?

Work Energy Theorem and Ring OF Work Done

The sign of work done by a force is important to understant. State carefully if the following quantities are positive or negative. (a) Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket. (b) Work done by the gravitational force in the above case. (c ) Work done by friction on a body sliding down an inclined plane. (d) Work done by an applied froce on a body moving on a rough horizontal plane with uniform velocity. (e ) Work done by the resistive force of air on a vibrating pendulum in bringing it to rest.

Work Done by Variable Force||Work Done by Normal||Tension||Gravity