Work done by a frictional force is

(1) Negative

(2) Positive

(3) Zero

(4) All of the above

Concept Questions :-

Concept of work
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A block of mass 50 kg slides over a horizontal distance of 1 m. If the coefficient of friction between their surfaces is 0.2, then work done against friction is 

(1) 98 J

(2) 72J

(3) 56 J

(4) 34 J

Concept Questions :-

Concept of work
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A body of mass m is moving in a circle of radius r with a constant speed v. The force on the body is mv2r and is directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle

(1) mv2πr2

(2) Zero

(3) mv2r2

(4) πr2mv2

Concept Questions :-

Concept of work
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A man pushes a wall and fails to displace it. He does 

(1) Negative work

(2) Positive but not maximum work

(3) No work at all

(4) Maximum work

Concept Questions :-

Concept of work
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A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 joules, the angle which the force makes with the direction of motion of the body is

(1) 0°

(2) 30°

(3) 60°

(4) 90°

Concept Questions :-

Concept of work
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A force acts on a 30 gm particle in such a way that the position of the particle as a function of time is given by x=3t4t2+t3, where x is in metres and t is in seconds. The work done during the first 4 seconds is 

(1) 5.28 J

(2) 450 mJ

(3) 490 mJ

(4) 530 mJ

Concept Questions :-

Work done by variable force
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The work done in pulling up a block of wood weighing 2 kN for a length of 10m on a smooth plane inclined at an angle of 15° with the horizontal is (given: sin15°=0.2588):

(1) 4.36 kJ

(2) 5.17 kJ

(3) 8.91 kJ

(4) 9.82 kJ

Concept Questions :-

Concept of work
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A force F=5i^+6j^4k^ acting on a body, produces a displacement s=6i+5k. Work done by the force is 

(1) 18 units

(2) 15 units

(3) 12 units

(4) 10 units

Concept Questions :-

Concept of work
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A body of mass 6kg is under a force which causes displacement in it given by S=t24 metres where t is time. The work done by the force in 2 seconds is-

(1) 12 J

(2) 9 J

(3) 6 J

(4) 3 J

Concept Questions :-

Work done by variable force
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A force of (3​ i^+4j^) Newton acts on a body and displaces it by (3i^+4j^)m. The work done by the force is 

(1) 10 J

(2) 12 J

(3) 16 J

(4) 25 J

Concept Questions :-

Concept of work
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Difficulty Level: