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.
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.
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.
Haleemah said:
1 decade ago
Work done in lifting is greater than that of rolling.
MohaMad IqBal WaNi said:
1 decade ago
D is 100 % correct answer.
Node pinches said:
1 decade ago
Lifting a stone is against gravity while roling is supported by gravity.
Naveen said:
1 decade ago
In the case of rolling the body is motion so, small work is done.
Asiimwe Shabani said:
9 years ago
I agree with the given answer i.e D.
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.
Chris said:
8 years ago
The work done in rolling is mg sin(theta) multiply by the length of the slope (assuming no friction) where theta is less than 90°. But work done in lifting vertically should be mgh where h is the height of the slope and angle to horizontal is 90. since sine of any angle less than 90° is always less than one, working in rolling is always less than the work done in lifting.
Pavankumar said:
8 years ago
Answer is D. Because for lifting objects it has more force of gravity and for rolling objects, it is less, friction of rolling is less. So it is easy to roll the stone.
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