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 3 of 9.
Santosh kumar said:
1 decade ago
We know that a slope has a angle and a friction cause for non plane surface though gravity force F=mg where g is approxi constant so the force depend on the mass of object when we pull that object both our force and gravity force are occurred so it is easy to pull but hard to push.
Muhammad Suhail said:
1 decade ago
The correct answer is C. The work done in lifting is just the increase in potential energy, whereas the work done on the incline plane is the sum of the increase in potential energy and the work done against friction. Thus the work done along the inclined plane is in fact greater.
Danquah Seth said:
9 years ago
Work done in rolling is less than lifting it up because the work done is force per distance of an object.
Here the force becomes directly proportional to the distance while in lifting the force becomes inversely proportional to distance because of potential energy possessed.
Here the force becomes directly proportional to the distance while in lifting the force becomes inversely proportional to distance because of potential energy possessed.
Jun said:
9 years ago
The questioned mentioned 'rolling'. Thus friction does not apply at all and as seen in many comments, work= force x distance, force is mg and is constant. Distance traveled is the same too as vertical height achieved is equal. (Horizontal distance of slope is not counted).
Stephen said:
1 decade ago
The answer is C. Work is force times distance. In this case, the force is the mass times gravity. Rolling up the hill reduces the magnitude of the force but increases the distance by the same magnitude, thus making the work the same; the rate is just decreased.
Veenu Mishra said:
1 decade ago
This is related to concept of pulling and pushing. During pulling process friction force opposes the force applied hence work is increased in this case.
But in pushing (or rolling in this case) friction force helps and hence work is decreased. :).
But in pushing (or rolling in this case) friction force helps and hence work is decreased. :).
Aman krishna said:
1 decade ago
Here we have to consider the concept of inclined plane no doubt the amount of work done is same either we do it by rolling or pulling but one of the benefit is that gravitation force will be neglected.
More the slope less will be the effort.
More the slope less will be the effort.
Gary Bau said:
1 decade ago
Answer C is correct.
In this context of rate of energy (power not work!) is greater and gravitational potential energy change (work) is the SAME.
To consider D is to revert to the thinking of Aristotle. Rather than Galileo and Newton.
In this context of rate of energy (power not work!) is greater and gravitational potential energy change (work) is the SAME.
To consider D is to revert to the thinking of Aristotle. Rather than Galileo and Newton.
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.
Vivek said:
1 decade ago
Work done in rolling is less than lifting due to a extra work has been done in lifting due to gravity means against the gravity but in rolling on a inclined plane we get a work done by gravity in downward direction along the gravity.
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