Question

A block of mass m is moved over a distance s. An applied force F is directed perpendicularly to the block’s displacement. In this case work done by force on the block will be
a. Positive
b. Negative
c. Zero
d. None​

Answer 1

Answer : Zero

Given : A block of mass m is moved over a distance s. An applied force F is directed perpendicularly to the block’s displacement

To find : work done by force on the block

Solution :

Here the work done by force on the block will be zero . This is so because in a case wherein the Applied force is perpendicular to the displacement then the work done is zero. For example you are carrying a load on your head and forming an angle of 90° with the ground means making a perpendicular to the surface . No matter how much long time you carry that the work done will be zero here .