Chapter 7 Work, Energy, and Simple Machines - Part 3
What is the work done in dragging a box of mass 10 kg across a rough horizontal floor over a distance of 5 m against a c...
Type: MCQ • Marks: 1
What is the work done in dragging a box of mass 10 kg across a rough horizontal floor over a distance of 5 m against a constant frictional force of 20 N?
Options
A. 0 J
B. 100 J
C. 500 J
D. -100 J
Explanation
Friction acts opposite to displacement, performing negative work: W = -F × s = -20 N × 5 m = -100 J.
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Class 9thScience (MCQ)
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