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 6 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.
Aliyu mukhtar muhammad said:
1 decade ago
The answer will be fall on the option if we look the question thoroughly.
Alia said:
1 decade ago
When a stone is rolled up in an inclined plane than it is easier to apply force in upward direction because pulling is easier than pushing & one can use it's own weight while pushing as in case of pulley. So the answer will be D because firstly gravity is acting directly & vertically downward and secondly frictional force is introduced less in an inclined plane due to minimum contact with the road.
Roktima said:
1 decade ago
When we are lifting any object vertically, we just work against gravity (non-contact force). It is no matter whether the road is slope down or slope up. But in 2nd case, the concept of frictional force (contact force) is introduced. A roller touches its minimum parts on ground, so there less friction arises and it is easy to move. In case of moving downward we have to apply less energy than to moving upward just because of gravity.
Jai said:
1 decade ago
Force of gravity acting on stone in vertical position is greater than that of force acting.
Samsudeen lastborn said:
1 decade ago
(lifting and pulling) both will experience an opposition force. In lifting a force of gravity will be oppose while in that of pulling it experience d frictional force. i.e work done in lifting will be more than that of the pulling.
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. :).
Jennifer said:
1 decade ago
This is practical. When lifting an object gravity takes more place than when rolling.
Hassan tukur said:
1 decade ago
On my way becouse in the throwing the stone gravitational force oppose the motion but in rolling it on the ground there is no gravitational force opposing the motion.
DEBBRATA GHOSH said:
1 decade ago
I Know that When a Stone rolling, in that time friction Worked but its quantity not more than gravitational force. That caused option D is right.
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