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.
Zoha nasir said:
1 decade ago
Since, the coefficient of rolling friction is less than the coefficient of sliding friction, the work done in rolling becomes less than lifting.
(1)
Curiosity said:
1 decade ago
Since in a simple machine effort * effort arm = load * load arm.
In this case it is effort * hypotenuse of the rt angled triangle = load * perpendicular.
But perpendicular<hypotenuse.
Therefore effort<load.
In this case it is effort * hypotenuse of the rt angled triangle = load * perpendicular.
But perpendicular<hypotenuse.
Therefore effort<load.
Mandar said:
1 decade ago
Work done is less if the object rolling and greater work is done if object lifting.
Mehak said:
1 decade ago
Because in lifting a ball work done is against gravity and so large effort is to be applied than to roll it.
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.
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.
Jennifer said:
1 decade ago
This is practical. When lifting an object gravity takes more place than when rolling.
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. :).
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.
Jai said:
1 decade ago
Force of gravity acting on stone in vertical position is greater than that of force acting.
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