General Knowledge - Physics - Discussion

Discussion Forum : Physics - Section 1 (Q.No. 2)
It is easier to roll a stone up a sloping road than to lift it vertical upwards because
work done in rolling is more than in lifting
work done in lifting the stone is equal to rolling it
work done in both is same but the rate of doing work is less in rolling
work done in rolling a stone is less than in lifting it
Answer: Option
No answer description is available. Let's discuss.
84 comments Page 1 of 9.

Yondu said:   3 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.

Isaiah mahona said:   4 years ago
The work done is the same but the rate of doing work is greater on lifting.

Ramana said:   4 years ago
C is the correct answer.

James said:   4 years ago

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.

Abhishek said:   5 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.

Sam said:   5 years ago

We conservation of linear momentum = angular momentum.

Emmy said:   5 years ago
I strongly agree with the answer, because when you roll less effort is applied than when lifting. Thanks.

Chua said:   6 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.

Varshitha said:   6 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.

Chris said:   6 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.

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