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When is the work done by a force is po...

When is the work done by a force is positive and negative ?

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KUMAR PRAKASHAN-WORK, ENERGY AND POWER -SECTION - C Objective Questions (VSQs)
  1. If vec(A) =2hat(i)-2hat(j) and vec(B)=2hat(k) then vec(A).vec(B) ……

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  2. When is the work done by a force is positive and negative ?

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  3. If vec(P).vec(Q) = 0 , then what is the angle between vec(P) and vec(...

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  4. If vec(P).vec(Q)=1 , then what is the angle between vec(P) and vec(Q) ...

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  5. If a friction of 200 N exerted opposite to the motion of a object dr...

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  6. If vec(A) = (2,-3,1) and vec(B) = (3,4,n) are mutually perpendicular t...

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  7. If vec(P) = (k,2,3) and vec(Q) = (0,3,k) and vec(P) bot vec(Q) , then ...

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  8. Find the work done by electric force on an electron revolves around t...

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  9. The work done by a gravitational force acting on a free fall body will...

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  10. Negative sign in W = -mgh denotes what ?

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  11. Whether the potential energy increases or decreases in the case of ris...

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  12. Define 1 eV:

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  13. Does potential energy of a spring decrease/increase when it is compres...

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  14. Can kinetic energy of a body by negative ? Potential energy be negativ...

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  15. What is the work done on the body moving in uniform circular motion ?

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  16. What is the area under the graph of F to x ? (F = external force , x =...

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  17. The momentum of two unequal bodies is same , then which onehas larger ...

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  18. The momentum of a body increased doubled .What is the percentage of i...

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  19. A body is thrown upward at intial velocity of 7 ms^(-1) , then at whic...

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  20. Obtain an equation of momentum in terms of mass and kinetic energy .

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