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Test: Conservative Forces


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Test: Conservative Forces - Question 1

Work done by gravitational force on a man, in lifting a bucket out of the well by rope tied to the bucket is

Detailed Solution for Test: Conservative Forces - Question 1

When the man pulls the bucket outside the well the gravitational potential of the man + bucket system increases and hence the work done by the gravitational force is negative.

Test: Conservative Forces - Question 2

For a conservative force, F is equal to

Detailed Solution for Test: Conservative Forces - Question 2

Potential energy at a point is defined in terms the amount of work done, which is defined in terms of force and thus we get potential as an integral of force applied over some position x. Hence F(x) = -dU(x) / dx which is the differentiation of potential energy wrt position.

Test: Conservative Forces - Question 3

Work done in motion of the body over a closed loop for conservative forces is

Test: Conservative Forces - Question 4

The conservative frictional force always acts ____________ to the surface of the application of the friction.

Detailed Solution for Test: Conservative Forces - Question 4

The friction is the phenomena that defines that there is a resistance which is present there between the two surfaces. This friction is applied tangentially to the surfaces in contact. Thus the main thing is that the forces on both of the surfaces act tangential to each other.

Test: Conservative Forces - Question 5

Work done by or against a conservative force in a round trip is

Detailed Solution for Test: Conservative Forces - Question 5

A conservative force is a force with the property that the total work done in moving a particle between two points is independent of the taken path. Equivalently, if a particle travels in a closed loop, the total work done (the sum of the force acting along the path multiplied by the displacement) by a conservative force is zero.

Test: Conservative Forces - Question 6

Select the odd one out

Detailed Solution for Test: Conservative Forces - Question 6

Frictional force, Air-resistance, viscous force all these forces work against each other i.e., they are opposing forces, while electrostatic force is not a opposing force.

Test: Conservative Forces - Question 7

A force which does not depend on the path taken to increase the potential energy is

Detailed Solution for Test: Conservative Forces - Question 7

A force is said to be conservative if the work done by or against the force on a body is independent of path followed by the body and depends only on initial and final positions.
Work done by or against the conservative force in moving a particle along a closed path is zero.
Hence C is correct.

Test: Conservative Forces - Question 8

Which of the following is not conserved in inelastic collision?

Detailed Solution for Test: Conservative Forces - Question 8

In an inelastic collision, the force of reformation is not equal to the force of deformation and thus some amount of energy is lost. But still as no external force acts upon the system momentum is still conserved.

Test: Conservative Forces - Question 9

When conservative force does positive work on a body, the potential energy of the body:

Detailed Solution for Test: Conservative Forces - Question 9

We have a relation between potential energy and work done:
The negative sign just shows the inverse relation between potential energy and work done by conservative force.

Test: Conservative Forces - Question 10

Which of the following statement is not related to conservative force?

Detailed Solution for Test: Conservative Forces - Question 10

A force is said to be conservative if the work done by or against the force on a body is independent of path followed by the body and depends only on initial and final positions.
Work done by or against the conservative force in moving a particle along a closed path is zero.

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