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GK QUESTION#2997

Consider the effect of forces on the motion of an object: I. Unbalanced forces can change the speed or direction of motion. II. Balanced forces are responsible for producing acceleration. Which of the above statements is/are correct?

  1. AOnly ICorrect answer
  2. BOnly II
  3. CBoth I and II
  4. DNeither I nor II
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Answer

A. Only I

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Explanation

Only I is correct. A nonzero resultant force can change velocity. Balanced forces have zero resultant and do not produce acceleration of the body’s centre of mass under the stated Newtonian conditions.

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