01. What is Work?
In physics, work is done on an object when a force causes it to move a certain distance. It's a way of transferring energy.
Formula (for a constant force): Work (W) is the product of the force (F) applied in the direction of motion and the distance (d) the object moves.where \theta is the angle between the force and the direction of displacement.
Units: Work is measured in Joules (J). (1 Joule = 1 Newton-meter)
Key Points about Work:
Positive Work: If the force (or a component of it) is in the same direction as the displacement (theta < 90), the work done is positive. This adds energy to the object.
Negative Work: If the force (or a component of it) is in the opposite direction of the displacement (theta > 90), the work done is negative. This removes energy from the object. (Example: Friction)
Zero Work: If the force is perpendicular to the displacement (\theta = 90^\circ), no work is done. (Example: Carrying a bag horizontally at a constant velocity - the lifting force is up, displacement is forward).
