General Science - Physics (Basics)
RRB Group D 2024: Which of the following statements is true about work done by a force?
RRB Group D 2024: Which of the following statements is true about work done by a force?
medium Q6 of 15
Step-by-Step Solution
Step 1: Understand work done sign
Work done depends on the angle between force and displacement; it can be positive, zero, or negative.Step 2: Analyze options
Work done is negative when force acts opposite to displacement (cos 180° = -1). It is zero when force is perpendicular, and maximum when force and displacement are in the same direction.Final Answer:
Work done is negative when force acts opposite to displacement → Option BQuick Check:
Work done negative = Force opposite displacement ✅
Quick Trick: Negative work when force opposes displacement.
Common Mistakes:
MISTAKES- Assuming work done is always positive or zero when force is perpendicular.
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