When do we say that work is done ?

Explanation

To determine when work is done, we need to consider the following steps:

### Step 1: Understanding Work
Work is defined in physics as the transfer of energy that occurs when a force is applied to an object, causing it to move.

### Step 2: Conditions for Work to be Done
For work to be considered done, two main conditions must be satisfied:
1. A force must be applied to the object.
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