Mechanical Energy of Earth-Moon System – Rankers Physics

Planet and Satellite: Practice Problem & Solution

Assertion (A): The mechanical energy of earth-moon system remains same when a heavenly body passes nearby the earth-moon system. Reason (R): Force exerted by heavenly body on the earth-moon system is non-conservative.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Planet and Satellite. Understanding the underlying formula is key to arriving at the correct answer below:

Assertion (A) is false:

An external heavenly body exerts a gravitational force on the Earth-Moon system, causing its mechanical energy to change.

Reason (R) is false: Gravitational force is a conservative force by nature. Therefore, both Assertion (A) and Reason (R) are false.

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