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Work and Energy — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceWork and Energy3 Marks
Question
Give one example each in which a force does $(a)$ positive work $(b)$ negative work, and $(c)$ zero work.
✓

Answer

  1. Positive work: Work done by the force applied by a person on a ball that is thrown upwards.
  2. Negative work: Work done by gravitational force of earth on a ball thrown upwards.
  3. Zero work: Work done by gravitational force of earth on a box that is sliding horizontally on the ground.

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