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MDCAT
Physics
2021

Physics · Work, Power & Energy

Work through this past-paper style MCQ, then read the full explanation. Practice more physics questions on mMCQ with adaptive practice and topic analytics.

Question

A variable force F = x is applied what will be the work done in moving the particle from X= 0 to 1

Options
  • A

    2 J

  • B

    1 J

  • C

    0.5 J

  • D

    5 J

Explanation

The work done in moving a particle from x=0 to x=1 when a variable force F=x is applied can be found by integrating the force over the distance. The work done W is given by:
W = ∫x=0 to x=1 F(x) dx
W = ∫x=0 to x=1 x dx
W =[x2/2] from 0 to 1
W = (12/2) - (02/2)
W = 1/2 units of work 

Therefore, the work done in moving the particle from x=0 to x=1 with a variable force F=x is 1/2 units of work.

Mathematically the options are incorrect. 

The work done in moving a particle from x=0 to x=1 when a variable force F=x is applied can be found by integrating the force over the distance. The work done W is given by:
W = ∫x=0 to x=1 F(x) dx
W = ∫x=0 to x=1 x dx
W =[x
2/2] from 0 to 1
W = (1
2/2) - (02/2)
W = 1/2 units of work

The work done in moving a particle from x=0 to x=1 when a variable force F=x is applied can be found by integrating the force over the distance. The work done W is given by:
W = ∫x=0 to x=1 F(x) dx
W = ∫x=0 to x=1 x dx
W =[x
2/2] from 0 to 1
W = (1
2/2) - (02/2)
W = 1/2 units of work
 

The work done in moving a particle from x=0 to x=1 when a variable force F=x is applied can be found by integrating the force over the distance. The work done W is given by:
W = ∫x=0 to x=1 F(x) dx
W = ∫x=0 to x=1 x dx
W =[x
2/2] from 0 to 1
W = (1
2/2) - (02/2)
W = 1/2 units of work
 

The work done in moving a particle from x=0 to x=1 when a variable force F=x is applied can be found by integrating the force over the distance. The work done W is given by:
W = ∫x=0 to x=1 F(x) dx
W = ∫x=0 to x=1 x dx
W =[x
2/2] from 0 to 1
W = (1
2/2) - (02/2)
W = 1/2 units of work
 

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Tagged under Physics · Work, Power & Energy · 2021