Mechanical Engineering - Engineering Mechanics - Discussion
Discussion Forum : Engineering Mechanics - Section 1 (Q.No. 46)
46.
Work done is said to be zero, when
Discussion:
19 comments Page 1 of 2.
Scientist atanu said:
4 years ago
Newton 1st law ....anybody will motion has no friction force that's case, body will continue the motion and anybody will rest with no force can apply this body will rest every time.
so,
W=F * Displacement.
option A is;
Force is known ( Newtown 1, 2, 3,......n)
displacement is Zero
W=F * 0,
W=0.
option B is;
Force =0 , displacement is known,
W=0 * D
W=0.
So, option C Either (a) or (b) is Right.
so,
W=F * Displacement.
option A is;
Force is known ( Newtown 1, 2, 3,......n)
displacement is Zero
W=F * 0,
W=0.
option B is;
Force =0 , displacement is known,
W=0 * D
W=0.
So, option C Either (a) or (b) is Right.
(2)
Dhanendra sahu said:
9 years ago
I think A is the correct answer but given an answer is (c) then I would like to think moreover as when a body placed on some height and if we allow it to fall freely (under the action of gravity) it is said to be displaced but not work done on it.
Aniket said:
1 decade ago
My query is if I m pushing a table from one place to another and again bringing it back to the same position then the displacement is zero but work done is not zero. So how can it be either (a) or (b). please explain?
Gurpreet singh said:
8 years ago
Freely falling bodies have displacement and force is the gravitational force only. no external force.w=force*displacement.
A and B either is zero work will be zero. So I think (d) is the answer.
A and B either is zero work will be zero. So I think (d) is the answer.
Parth said:
10 years ago
If the magnitude of the force is zero, if the magnitude of displacement is zero, or if the angle between the displacement and force vector is 90 degrees.
Neeraj said:
7 years ago
How can say that without a force body will move?
While Newtown says without force any body can't move. It is not Either A or B. It will be A only.
While Newtown says without force any body can't move. It is not Either A or B. It will be A only.
(1)
Shivaraj said:
10 years ago
I think the correct option should be A only. One need to understand that it is impossible for body to have displacement without applying force.
Wahid said:
8 years ago
If the body moves at a constant velocity, in that case the acceleration is zero. However the body is still displaced.
Mighty M said:
8 years ago
Dilute has the clear picture; Work done W is given as; W=Fd (when F or d equals zero, W equals zero).
Dilute said:
1 decade ago
Since we know w=f*s, So if one of this factors (f or s) becomes zero then work done is zero.
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