from two example show how the value of displacement be zero and negative
Answers
Answer:
POSITIVE WORK: The work done on an object is said to be positive work when force and displacement are in same direction.
Example: When an object moves on horizontal surface, force and displacement acts in same direction. So, work done is positive.
NEGATIVE WORK: The work done is said to be negative work when force and displacement are in opposite direction.
Example: When an object is thrown upwards,the force of gravity is in downward direction whereas displacement acts in upward direction.
ZERO WORK: The work done is said to be zero when force and displacement are perpendicular to each other or when either force or displacement is zero.
Example: When we hold an object and walk, the force acts in downward direction whereas displacement acts in forward direction.
Explanation:
Displacement can be negative because it defines a change in position of an object while carefully monitoring its direction.
For our example the object we will consider is you. If you leave your present position and walk down a hallway to get a drink and you walk
6
m
to where the drink is located, your displacement is
6
m
in the
h
(hallway) direction. We will take this first trip as the positive direction
Then you walk back towards your original location in the
−
h
opposite direction. But Surien calls you to her office which is
15
m
further past your office. It is still in the direction
−
h
opposite the drink location.
Your displacement is now
6
m
−
6
m
−
15
m
=
−
15
m
in the
h
direction. Notice both displacements had to be subtracted from the
+
h
of your first trip because both were in the
−
h
direction from it.
Then you return to your original location.
Now your total displacement is:
6
m
−
6
m
−
15
m
+
15
m
=
0
m
in the
h
direction.
Because of positive and negative displacement vectors, you have essentially gone nowhere. You can verify this by looking around. You are back at your original location.
While accomplishing this feat, you have managed to cover a distance of
6
m
+
6
m
+
15
m
+
15
m
=
42
m
Time for another drink....
Explanation:
hope this helps
Mark me as branilist ✌