Class 9 Exam > Class 9 Questions > Find the incorrect statementa)the P. E of a f...
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Find the incorrect statement
- a)the P. E of a freely falling object increases progressively
- b)K.E. is converted into heat and sound energy when a freely falling object eventually stops on reaching the ground
- c)there is no transfer of energy between you and the rock when you push a huge rack and fail to move it
- d)body at rest may possess energy
Correct answer is option 'A'. Can you explain this answer?
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Find the incorrect statementa)the P. E of a freely falling object incr...
The potential energy of a freely falling object decreases progressively due to decrease in height. Kinetic energy is converted into heat and sound energy when a freely falling object on reaching the ground. Work is done only when change in position occurs.
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Find the incorrect statementa)the P. E of a freely falling object incr...
Understanding Potential Energy in Free Fall
The statement in option A is incorrect because it misrepresents the nature of potential energy (P.E.) in a freely falling object.
Key Concepts of Free Fall
- Potential Energy (P.E.): This is the energy an object possesses due to its position relative to the ground. For an object at a height, P.E. is calculated based on its mass and height above the ground.
- Free Fall Dynamics: As an object falls freely under the influence of gravity, its height decreases, which leads to a decrease in its potential energy.
Why Option A is Incorrect
- Decrease in P.E.: When an object is dropped, its potential energy decreases progressively as it falls closer to the ground.
- Conversion to Kinetic Energy: The lost potential energy is converted into kinetic energy (K.E.). Thus, while the object falls, its kinetic energy increases as it accelerates towards the ground.
Other Statements Analysis
- Statement B: Correctly states that kinetic energy is converted into other forms like heat and sound when the object stops.
- Statement C: Accurately describes that no energy transfer occurs when you push a large rock without moving it.
- Statement D: Correctly indicates that a body at rest can possess energy in the form of potential energy, such as a compressed spring or a charged battery.
In summary, option A is incorrect because the potential energy of a freely falling object does not increase; it decreases as the object falls.
The statement in option A is incorrect because it misrepresents the nature of potential energy (P.E.) in a freely falling object.
Key Concepts of Free Fall
- Potential Energy (P.E.): This is the energy an object possesses due to its position relative to the ground. For an object at a height, P.E. is calculated based on its mass and height above the ground.
- Free Fall Dynamics: As an object falls freely under the influence of gravity, its height decreases, which leads to a decrease in its potential energy.
Why Option A is Incorrect
- Decrease in P.E.: When an object is dropped, its potential energy decreases progressively as it falls closer to the ground.
- Conversion to Kinetic Energy: The lost potential energy is converted into kinetic energy (K.E.). Thus, while the object falls, its kinetic energy increases as it accelerates towards the ground.
Other Statements Analysis
- Statement B: Correctly states that kinetic energy is converted into other forms like heat and sound when the object stops.
- Statement C: Accurately describes that no energy transfer occurs when you push a large rock without moving it.
- Statement D: Correctly indicates that a body at rest can possess energy in the form of potential energy, such as a compressed spring or a charged battery.
In summary, option A is incorrect because the potential energy of a freely falling object does not increase; it decreases as the object falls.
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Find the incorrect statementa)the P. E of a freely falling object increases progressivelyb)K.E. is converted into heat and sound energy when a freely falling object eventually stops on reaching the groundc)there is no transfer of energy between you and the rock when you push a huge rack and fail to move itd)body at rest may possess energyCorrect answer is option 'A'. Can you explain this answer?
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Find the incorrect statementa)the P. E of a freely falling object increases progressivelyb)K.E. is converted into heat and sound energy when a freely falling object eventually stops on reaching the groundc)there is no transfer of energy between you and the rock when you push a huge rack and fail to move itd)body at rest may possess energyCorrect answer is option 'A'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about Find the incorrect statementa)the P. E of a freely falling object increases progressivelyb)K.E. is converted into heat and sound energy when a freely falling object eventually stops on reaching the groundc)there is no transfer of energy between you and the rock when you push a huge rack and fail to move itd)body at rest may possess energyCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Find the incorrect statementa)the P. E of a freely falling object increases progressivelyb)K.E. is converted into heat and sound energy when a freely falling object eventually stops on reaching the groundc)there is no transfer of energy between you and the rock when you push a huge rack and fail to move itd)body at rest may possess energyCorrect answer is option 'A'. Can you explain this answer?.
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Find the incorrect statementa)the P. E of a freely falling object increases progressivelyb)K.E. is converted into heat and sound energy when a freely falling object eventually stops on reaching the groundc)there is no transfer of energy between you and the rock when you push a huge rack and fail to move itd)body at rest may possess energyCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for Find the incorrect statementa)the P. E of a freely falling object increases progressivelyb)K.E. is converted into heat and sound energy when a freely falling object eventually stops on reaching the groundc)there is no transfer of energy between you and the rock when you push a huge rack and fail to move itd)body at rest may possess energyCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of Find the incorrect statementa)the P. E of a freely falling object increases progressivelyb)K.E. is converted into heat and sound energy when a freely falling object eventually stops on reaching the groundc)there is no transfer of energy between you and the rock when you push a huge rack and fail to move itd)body at rest may possess energyCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
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