Per NCERT, if a girl carries a box HORIZONTALLY while applying an UPWARD force equal to its weight, how much work does she do on the box via that upward force?
AMaximum work — they're both motion
BEqual to the weight times the horizontal distance
CNegative work — the force opposes motion
DZero — force (upward) is perpendicular to displacement (horizontal), so no work
Answer & Solution
Correct answer: D. Zero — force (upward) is perpendicular to displacement (horizontal), so no work
Per NCERT §7.1.1 Fig 7.6, perpendicular force does zero work (cos 90° = 0). The other options misstate.
Related questions
Per NCERT, while exercising, a girl lifts a dumbbell UP and then slowly lowers it DOWN. WhPer NCERT, what does the AREA under a FORCE vs DISPLACEMENT graph represent?Per NCERT, when you push against a rigid wall with all your strength, how much work do youPer NCERT Example 7.2, a goalkeeper's hand moves back by 15 cm while applying a force of 2Per NCERT, what does NEGATIVE work done mean?Per NCERT, what does POSITIVE work done mean?Per NCERT, when is the work done on an object equal to ZERO — even if a force is applied?Per NCERT, 1 joule equals which combination of SI base units?