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 5 of 9.
Iqra said:
1 decade ago
Answer is D during rolling on an inclined plane the sin (downward) component of gravitation force is zero while cos component is present at the time there is pushing force which is greater and opposite to this component of force and hence this component of force is neglected. And there is only force that is pushing force.
Hence work done is less in rolling.
Hence work done is less in rolling.
Sourin said:
1 decade ago
In rolling there's two components horizontal and vertical are acting and so the force or work required to roll on slope is divided into frictional resistance and partially to gravity. While in case of lifting have to overcome only the vertical component i.e, gravity so it becomes hard to fight gravity than to friction.
Naveen said:
1 decade ago
In the case of rolling the body is motion so, small work is done.
Brighty said:
1 decade ago
If we roll any object from slope or from any were the rolling of the body is less compared to lifting the object so the this the correct answer.
Node pinches said:
1 decade ago
Lifting a stone is against gravity while roling is supported by gravity.
MohaMad IqBal WaNi said:
1 decade ago
D is 100 % correct answer.
Haleemah said:
1 decade ago
Work done in lifting is greater than that of rolling.
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.
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.
Siddharth awasthi said:
1 decade ago
It is wrong.
Work done in both the cases is the same.
Because the work done is equal to the gain in potential energy and since they are being raised to the same height, the energy is same so the work in same. In case of rolling only the force required Is small but the work done is same.
Work done in both the cases is the same.
Because the work done is equal to the gain in potential energy and since they are being raised to the same height, the energy is same so the work in same. In case of rolling only the force required Is small but the work done is same.
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