General Science - Physics (Basics)
SSC CGL 2024: Which of the following statements about work done by frictional force is correct?
SSC CGL 2024: Which of the following statements about work done by frictional force is correct?
hard Q10 of 15
Step-by-Step Solution
Step 1: Understand frictional force direction
Friction always acts opposite to the direction of motion or attempted motion.Step 2: Analyze work done by friction
Since friction opposes displacement, the angle between force and displacement is 180°, so work done is negative.Step 3: Evaluate other options
Friction does not increase kinetic energy, so positive work is incorrect. It is not perpendicular to displacement, so zero work is incorrect. Friction acts even when object moves, so Friction does work only when the object is at rest is incorrect.Final Answer:
Friction does negative work by opposing motion → Option AQuick Check:
Work done by friction = Negative due to opposing motion ✅
Quick Trick: Friction always does negative work during motion.
Common Mistakes:
MISTAKES- Assuming friction does positive or zero work.
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