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 2 of 9.
Iqra said:
1 decade ago
Answer is D during rolling on an inclined plane the sin (downward) component of gravitation force is zero while cos component is present at the time there is pushing force which is greater and opposite to this component of force and hence this component of force is neglected. And there is only force that is pushing force.
Hence work done is less in rolling.
Hence work done is less in rolling.
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)
Sourin said:
1 decade ago
In rolling there's two components horizontal and vertical are acting and so the force or work required to roll on slope is divided into frictional resistance and partially to gravity. While in case of lifting have to overcome only the vertical component i.e, gravity so it becomes hard to fight gravity than to friction.
Ryan said:
1 decade ago
It may be a controversial issue since the question itself is not well asked in the first place. It all depends whether the two balls travel with the same displacement or not. Considering that they travel with the same displacement, more work is required to lift the ball vertically than to roll it along a slope.
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)
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)
Sandeep na said:
1 decade ago
During rolling a stone potential energy stored in the body and kinetic friction between the stone increases and during lifting the body, the work done against the gravity according to newton second law. F=ma. During rolling the stone the force is towards the earth and also momentum increases.
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.
Hassan ibrahim said:
10 years ago
Definitely the correct option is D, if we thrown the stone vertically we lost more effort and the stone is directly return to the original position due to the gravity but when you thrown the stone incline there is no gravity and friction. So the work done in lifting is less than in rolling.
Siddharth awasthi said:
1 decade ago
It is wrong.
Work done in both the cases is the same.
Because the work done is equal to the gain in potential energy and since they are being raised to the same height, the energy is same so the work in same. In case of rolling only the force required Is small but the work done is same.
Work done in both the cases is the same.
Because the work done is equal to the gain in potential energy and since they are being raised to the same height, the energy is same so the work in same. In case of rolling only the force required Is small but the work done is same.
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