Physics · Work, Power & Energy
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Work done is said to be negative if force and displacement are ___.
- A
Parallel
- B
Perpendicular
- C
Anti parallel
- D
None of these
When the direction of motion and force acting on body are opposite i.e anti parallel, the work done is said to be negative.
W = Fd
W = Fd cos 180°
W = -Fd
A . W = Fd cos 0°
W = Fd
B . W = Fd cos 90°
W = 0
A . W = Fd cos 0°
W = Fd
So, this is incorrect.
B . W = Fd cos 90°
W = 0
So, this is incorrect.
W = Fd
W = Fd cos 180°
W = -Fd
This is the correct answer.
This is incorrect.
Option C is correct
Tagged under Physics · Work, Power & Energy · 2021