Which one of the following is non-conservative?
Correct answer: D. all of these
- A. friction
- B. tension in string
- C. air resistance
- D. all of these
Explanation
Here's why each option is correct:(a) Friction: When objects rub against each other, friction causes energy to be converted into thermal energy (heat). This lost energy cannot be fully recovered as usable work, making it a non-conservative force.(b) Tension in string: While tension in an ideal string might seem conservative as the work done seems independent of the path, real-world strings have internal friction that dissipates energy as heat, making it non-conservative.(c) Air resistance: Similar to friction, air resistance acts against an object's motion, converting kinetic energy into thermal energy. This energy loss makes air resistance a non-conservative force.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
Practise Work and Energy
748 free Work and Energy MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Work and Energy questions
At which angle is the work done equal to half of its maximum value?
Escape velocity of a body depends upon
The consumption of energy by a 60-watt bulb in 2 seconds is
The food which we eat in 3 days produces energy equal to the energy from _liters of petrol:
A body moves a distance of 10 m along a straight line under the action of a force of 5 newton if the work done is 25 joules, the angle which the force takes with the direction of the motion of the body is:
The gravitational field in a region is given by the equation E = (5i + 12j) N/kg. If a particle of mass 2 kg is moved from the origin to the point (12m, 5m) in this region, the change in gravitational potential energy is