General Knowledge - Physics - Discussion
Discussion Forum : Physics - Section 1 (Q.No. 2)
2.
It is easier to roll a stone up a sloping road than to lift it vertical upwards because
Discussion:
84 comments Page 8 of 9.
Jun said:
9 years ago
(Zain said: (Nov 25, 2016).
The work doesn't change in both cases, it's true the gravitational force will less in the second case but the distance will be greater so that the work is same. ).
Fgs, gravitational force is constant and only vertical distance is relevant so it's the same too.
The work doesn't change in both cases, it's true the gravitational force will less in the second case but the distance will be greater so that the work is same. ).
Fgs, gravitational force is constant and only vertical distance is relevant so it's the same too.
Usman abdullahi karwai said:
9 years ago
Answer is D, because the ball rolling is against the gravity that's why it's less.
Sharma said:
9 years ago
The exact answar should be D. Because in vertically upward we have to force against mg. But in rolling the opposite force is mgsin. And we are putting force against mgsin. mgsin<mg. So rolling is less than vertically.
Pavankumar said:
8 years ago
Answer is D. Because for lifting objects it has more force of gravity and for rolling objects, it is less, friction of rolling is less. So it is easy to roll the stone.
Chris said:
8 years ago
The work done in rolling is mg sin(theta) multiply by the length of the slope (assuming no friction) where theta is less than 90°. But work done in lifting vertically should be mgh where h is the height of the slope and angle to horizontal is 90. since sine of any angle less than 90° is always less than one, working in rolling is always less than the work done in lifting.
Varshitha said:
8 years ago
Since we are rolling in an inclined plane frictional force is less an due to gravitational force lesser work is required, we lift the object it's against gravitational force w=mg is acting so more work is required. And the answer is D.
Chua said:
8 years ago
The answer should be C. Work done is the same (neglecting frictional force). Pushing force is mgsin but pushing distance is mgh/sin. So work done work done is still mgh in both cases.
(2)
Emmy said:
7 years ago
I strongly agree with the answer, because when you roll less effort is applied than when lifting. Thanks.
(2)
Sam said:
7 years ago
@ALL.
We conservation of linear momentum = angular momentum.
We conservation of linear momentum = angular momentum.
(1)
Abhishek said:
7 years ago
The answer is option D because rolling is easier than lifting because while lifting an object you opposing gravity, the more the mass of an object heavier the object, but in case of rolling the object is moving but without any opposition of strong as much as gravity but there will opposing force which is friction but It will not affect as much as gravity.
(3)
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