NEET Exam > NEET Questions > Statement-A: Work done by frictional force i...
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Statement-A: Work done by frictional force is always negative.
Statement-B: A body at rest can have mechanical energy.
- a)Both statements are correct
- b)Both statements are incorrect
- c)Statement A is correct and B is incorrect
- d)Statement A is incorrect and B is correct
Correct answer is option 'D'. Can you explain this answer?
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Statement-A: Work done by frictional force is always negative.Stateme...
Work done by friction may be zero, positive or negative. Body at rest can have mechanical energy due to its potential energy.
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Statement-A: Work done by frictional force is always negative.Stateme...
Explanation of Statement A
The statement "Work done by frictional force is always negative" is not entirely accurate.
- The work done by friction is negative when it opposes the direction of motion.
- However, in scenarios where the frictional force acts against the movement, it does indeed do negative work, reducing the system's kinetic energy.
- But if a body is stationary and friction acts to prevent motion, the work done is zero, not negative.
Explanation of Statement B
The statement "A body at rest can have mechanical energy" is correct.
- Mechanical energy consists of potential and kinetic energy.
- A body at rest has no kinetic energy (KE = 0), but it can still possess potential energy (PE) due to its position in a gravitational field or other fields.
- For example, a book on a shelf has gravitational potential energy even though it is at rest.
Conclusion
Thus, we conclude that:
- Statement A is incorrect because work done by friction can be zero, not always negative.
- Statement B is correct since a body at rest can possess potential energy.
Therefore, the correct answer is option 'D': Statement A is incorrect and Statement B is correct.
The statement "Work done by frictional force is always negative" is not entirely accurate.
- The work done by friction is negative when it opposes the direction of motion.
- However, in scenarios where the frictional force acts against the movement, it does indeed do negative work, reducing the system's kinetic energy.
- But if a body is stationary and friction acts to prevent motion, the work done is zero, not negative.
Explanation of Statement B
The statement "A body at rest can have mechanical energy" is correct.
- Mechanical energy consists of potential and kinetic energy.
- A body at rest has no kinetic energy (KE = 0), but it can still possess potential energy (PE) due to its position in a gravitational field or other fields.
- For example, a book on a shelf has gravitational potential energy even though it is at rest.
Conclusion
Thus, we conclude that:
- Statement A is incorrect because work done by friction can be zero, not always negative.
- Statement B is correct since a body at rest can possess potential energy.
Therefore, the correct answer is option 'D': Statement A is incorrect and Statement B is correct.
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Statement-A: Work done by frictional force is always negative.Statement-B: A body at rest can have mechanical energy.a)Both statements are correctb)Both statements are incorrectc)Statement A is correct and B is incorrectd)Statement A is incorrect and B is correctCorrect answer is option 'D'. Can you explain this answer?
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