- Work is defined as the force acting upon an object that causes an object to move.
- It is defined as the product of the magnitude of force and the displacement due to force.
W=F x s
Here, W= work done on an object
F = Force on the object
s = Displacement of the object
- Work done depends upon 2 factors
- Force: greater the force, greater the work done.
- Displacement: greater the displacement, greater the work done.
- When F=1N and s=1m then the work done will be 1Nm or 1J
- 1 Joule is defined as the work done by an object when 1N Force is applied on that object and the object is displaced by 1m.
- Work is Scalar physical quantity.
- Work done is of three types.
- When force and displacement acts on the same direction, then the work is said to be positive work.
- In positive work, force applied by the object and displacement produce follows the same path.
- When the value of angle (Ɵ) is less than 90°, the work is said to be positive.
- When force and displacement acts on the opposite direction, then the work is said to be negative work.
- In negative work, force applied by the object and displacement produce follows the opposite path.
- In this case, displacement is opposite to the direction of force.
Zero work done
- When the displacement is perpendicular to the work done then the work done is said to be zero.
- When the value of angle (Ɵ) is equal to 90°, the work is said to be zero.
- W= 0 as cos90°=0, therefore, work done is zero.