Grade 8 Exam  >  Grade 8 Questions  >  Choose the correctly matched pair.a) Work don... Start Learning for Free
Choose the correctly matched pair.
  • a)
    Work done when force is zero - Positive work
  • b)
    Work done when force and displacement are in opposite directions - Negative work
  • c)
    Work done when force is applied but no displacement occurs - Work is done
  • d)
    Work done when force and displacement are perpendicular - Maximum work
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Choose the correctly matched pair.a) Work done when force is zero - Po...
  • Let's evaluate each option based on the principles described in the text:
  • Option A: (a) Work done when force is zero - Positive work
    This is incorrect. When the force applied is zero, no work is done, regardless of any displacement.
  • Option B: (b) Work done when force and displacement are in opposite directions - Negative work
    This is correct. When the force acts in the opposite direction to the displacement, the work done is negative, as explained in the text.
  • Option C: (c) Work done when force is applied but no displacement occurs - Work is done
    This is incorrect. For work to be done according to the scientific definition, there must be both force and displacement. If there's no displacement, no work is done.
  • Option D: (d) Work done when force and displacement are perpendicular - Maximum work
    This is incorrect. When force and displacement are perpendicular, no work is done because the cosine of 90 degrees is zero, making the work zero.
  • Therefore, the correctly matched pair is Option B.
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Choose the correctly matched pair.a) Work done when force is zero - Positive workb) Work done when force and displacement are in opposite directions - Negative workc) Work done when force is applied but no displacement occurs - Work is doned) Work done when force and displacement are perpendicular - Maximum workCorrect answer is option 'B'. Can you explain this answer?
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