Question

Define work and give its formula. Give some examples of situations where work is said to be done.

Answer 1

Defining work

1. A work is said to be done on a body when a force causes a displacement in its direction.
2. SI unit of work done is Joule.
3. The formula of work done is, $WorkDone=ForcexDisplacement$

Some examples

For the work to be done, there must be some displacement. If there is no displacement, no work is said to be done.

Work is done in the following situations :

1. Moving a table.
2. Pushing and pulling a door.
3. Walking.
4. Lifting a rock.