SSC
PHYSICS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
True
|
|
|
False
|
|
|
Either A or B
|
|
|
None of the above
|
Detailed explanation-1: -Answer. Answer: Work done is zero because the opposition of its weight is a vertical force and the displacement is horizontal.
Detailed explanation-2: -Work changes the amount of mechanical and internal energy possessed by objects. When work is done on a system or object, energy is added to it. When work is done by a system or object, it gives some of its energy to something else. Throwing a ball means a hand applies a force as an arm swings forward.
Detailed explanation-3: -When the force and displacement are in the opposite direction, the work done by the force is negative. Work of friction is always negative, since it always opposes motion. When the force and displacement are perpendicular, the work done by the force is zero.