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 1 of 9.
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)
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)
Yondu said:
5 years ago
According to me, C is the correct answer. Because no more or less work is done if the displacement is the same in both the case.
(1)
Zoha nasir said:
1 decade ago
Since, the coefficient of rolling friction is less than the coefficient of sliding friction, the work done in rolling becomes less than lifting.
(1)
Gaurav pandey 8867310148 said:
10 years ago
In case rollin their force component get resolved but in in case of lifting single force component act over body so according to work formula as we know that:
W = fdcoso.
Force component not resolved that's why value of cos increased. So over all work increased. against gravity f-is force d-is displacement.
W = fdcoso.
Force component not resolved that's why value of cos increased. So over all work increased. against gravity f-is force d-is displacement.
(1)
Sam said:
7 years ago
@ALL.
We conservation of linear momentum = angular momentum.
We conservation of linear momentum = angular momentum.
(1)
James said:
6 years ago
@All.
Here all are making a mistake with using "Force" and "Work". The work is the same in this question. Since you need less Force to push/pull the object on a slope (without friction applied) than vertically. But the distance is more on the Slope than vertically. Thus W = F x s -> W1 = W2.
Here all are making a mistake with using "Force" and "Work". The work is the same in this question. Since you need less Force to push/pull the object on a slope (without friction applied) than vertically. But the distance is more on the Slope than vertically. Thus W = F x s -> W1 = W2.
(1)
Ramana said:
6 years ago
C is the correct answer.
(1)
Isaiah mahona said:
6 years ago
The work done is the same but the rate of doing work is greater on lifting.
(1)
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