Question

In each of the given a force, F is acting on an object of mass, m. The direction of displacement is from west to east shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.

Answer 1

Answer:

work done by the force is Zero.............

Answer 2

Answer:

Workdone W=

F

.

S

=FS cosθ where θ is the angle between

F

and

S

For (a) : θ=90

o

∴ W=FS cos90

o

=0

For (b) : θ=0

o

∴ W=FS cos0

o

=FS>0

For (c) : θ=180

o

∴ W=FS cos180

o

=−FS<0