Pattern: Work done by a object
Description: When a force acts on an object over a distance, it is said to have done work on the object. When a force acts to cause an object to be displaced, three quantities must be known in order to calculate the work. Those three quantities are force, displacement and the angle between the force and the displacement. The work is subsequently calculated as where is the angle between the force and the displacement vectors. There are cases when the work done is zero, (i) when displacement is zero, (ii) when force is zero and (iii) when force and displacement are mutually perpendicular to each other.
Questions can be asked as:
- To find the angle between force and displacement
- To find the work done by the frictional force, gravitational force, tension or force due to weight
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