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Choose One Or More Correct Alternatives. Which of the Forces Involved in Dragging a Heavy Object on a Smooth, Horizontal Surface, Have the Same Magnitude? - Science and Technology

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Choose one or more correct alternatives.
Which of the forces involved  in dragging a heavy object on a smooth, horizontal surface, have the same magnitude? 
(i) the horizontal applied force
(ii) gravitational force
(iii) reaction force in vertical direction
(iv) force of friction  

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The gravitational force and the reaction force in vertical direction have same magnitude. Friction is not action as the horizontal surface is smooth.

Concept: Free Fall
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Balbharati Science and Technology 9th Standard Maharashtra State Board
Chapter 2 Work and Energy
Exercise | Q 2.3 | Page 28
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