A force F=(5i^+3j^+2k^)N is applied over a particle which displaces it from its origin to the point r=(2i^j^)m. The work done on the particle in joules is 

(1) – 7

(2) +7

(3) +10

(4) +13

Concept Questions :-

Concept of work
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It is easier to draw up a wooden block along an inclined plane than to haul it vertically, principally because 

(1) The friction is reduced

(2) The mass becomes smaller

(3) Only a part of the weight has to be overcome

(4) ‘g’ becomes smaller

Concept Questions :-

Concept of work
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Two bodies of masses 1 kg and 5 kg are dropped gently from the top of a tower. At a point 20 cm from the ground, both the bodies will have the same 

(1) Momentum

(2) Kinetic energy

(3) Velocity

(4) Total energy

Concept Questions :-

Concept of work
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A particle moves under the effect of a force F = Cx from x = 0 to x = x1. The work done in the process is 

(1) Cx12

(2) 12Cx12

(3) Cx1

(4) Zero

Concept Questions :-

Work done by variable force
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A cord is used to lower vertically a block of mass M by a distance d with constant downward acceleration g4. Work done by the cord on the block is 

(1) Mgd4

(2) 3Mgd4

(3) 3Mgd4

(4) Mgd 

Concept Questions :-

Gravitational Potential energy
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Two springs have their force constant as k1 and k2(k1>k2). When they are stretched by the same force 

(1) No work is done in case of both the springs

(2) Equal work is done in case of both the springs

(3) More work is done in case of second spring

(4) More work is done in case of first spring

Concept Questions :-

Elastic potential energy
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The potential energy of a certain spring when stretched through a distance ‘S’ is 10 joule. The amount of work (in joule) that must be done on this spring to stretch it through an additional distance ‘S’ will be:

(1) 30

(2) 40

(3) 10

(4) 20

Concept Questions :-

Elastic potential energy
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A position dependent force F=72x+3x2newton acts on a small body of mass 2 kg and displaces it from x = 0 to x = 5 m. The work done in joules is:

(1) 70

(2) 270

(3) 35

(4) 135

Concept Questions :-

Work done by variable force
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A body of mass 3 kg is under a force, which causes a displacement in it, given by S=t33 (in m). Find the work done by the force in first 2 seconds: 

(1) 2 J

(2) 3.8 J

(3) 5.2 J

(4) 24 J

Concept Questions :-

Work done by variable force
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A spring of force constant 800 N/m has an extension of 5cm. The work done in extending it from 5cm to 15 cm is:

(1) 16 J

(2) 8 J

(3) 32 J

(4) 24 J

Concept Questions :-

Elastic potential energy
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