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  3. 9th Class
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  5. Force and laws of motion

9th Class Science Force and laws of motion Question Bank Force And Laws Of Motion Summtive Subjective Problems

  • question_answer
    During the sharpening of a knife against a grinding wheel, the sparks from the rim of the wheel always fly tangentially. Why?

    Answer:

    When a knife is sharpened by placing it on a rotating iron disc, the sparks move away tangentially from the rim of the wheel, due to inertia of direction.


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