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)
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)
Rohit said:
8 years ago
How is it possible that without any force a body moves?
(1)
Patrick said:
9 years ago
There can't be displacement without force if Newton's first law is accepted.
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.
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).
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.
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.
Ed said:
9 years ago
It is impossible to get displacement without force.
Sagar007 said:
9 years ago
I think, Option A is correct.
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