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 8 of 9.
Raphael said:
1 decade ago
The energy required to roll it down is less than the energy it required to lift it up.
Victor ify said:
1 decade ago
Always remember that gravitational pull always tries to pull an object going upward downward so more work is done in lifting dan in rolling.
Vrishali said:
1 decade ago
Stone required less energy to rolling than lifting upward. It due to gravitational force of attraction acting on stone.
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.
Harini said:
1 decade ago
We need explanation please.
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. :).
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