Question

In which situation is no work considered to be done by a force?

when the angle is between the force and displacement is 180

when the angle is between the force and displacement is 90

when the angle is between the force and displacement is 45

when the angle is between the force and displacement is 0

Answer 1

Well if the angle is either 180 or 0...there is either a positive or negative work

at a 45 degree angle...there will some some type of force

at 90 degrees...there is no work done....think of it like a crane

a crane could be holding a giant beam.....and all the force would be either up/down....it would take NO work...to move that left/right

so if the angle between the 2 is 90 degrees, there is no work