SELECT * FROM question_mgmt as q WHERE id=6431 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=12 AND subId=16 AND chapterId=375 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 8th science Friction iqbal has to push a lighter box and seema has to p

Question:

Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?

Answer:

Irregularities increase the surface area for the friction. Force of friction depend on the interlocking of irregularities between two surfaces. Iqbal has to apply less force to push a lighter box because here the interlocking between the floor and the lighter box is very small. But Seema have to apply a greater force to push the heavy box because here the interlocking between the floor and the heavy box is very strong. Seema have to apply the larger force in comparison to Iqbal.


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