Displacement In The Direction Perpendicular To The Force: If the displacement of an object is perpendicular to the force acting on it, the work done by the force on the object is zero.
Consider, for example,
1.The force of gravity acting on an aeroplane flying in the sky. The force of gravity is in the downward direction, whereas the aeroplane’s displacement is in the horizontal direction, i.e., the force and the displacement are perpendicular to each other.
2. A coolie carrying load on his head. In this case, force is acting vertically downward (weight of load) and displacement is along horizontal direction i.e. force and displacement are perpendicular to each other. W = 0.
When Displacement is Perpendicular to the force | Work done = Force x displacement = F x s cos As cos is zero, therefore, work done is also zero |
When a body is wireled in a circle, the work done on it is | |||
Right Option : C | |||
View Explanation |
When a stone tied to a string is whirled in a circle, the work done on it by the string is | |||
Right Option : C | |||
View Explanation |
A block of weight W is pulled a distance along a horizontal table. The work done by the weight is - | |||
Right Option : B | |||
View Explanation |
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