What is the relationship between Earth's kinetic energy and a falling object?

[medical2]

About my thinking ! Kenetic E"

last week i am thinking about the kenetic energy of the Earth compared with the object that falling down .

I assume that it may be equal to 0 or ∞ but no why ??

How about you for this case ?

 

[Doc Al]

Not sure what you are asking about or why you'd compare the kinetic energy of the Earth (in what frame?) to the kinetic energy of a falling object.

 

[medical2]

Ohh sorry !

Hmm , i have ever seen comparison of the K.E of object 1 to K.E of object 2 while falling down . So in this case , i want to compared with the Earth instead of object 2.

thanks for answer , just doubt !

 

[Doc Al]

Hmm , i have ever seen comparison of the K.E of object 1 to K.E of object 2 while falling down . So in this case , i want to compared with the Earth instead of object 2.

I'm still not understanding what you want to do. Usually, one measures the speed of the falling body--and thus its kinetic energy--with respect to the ground. What do you propose instead?

 

[medical2]

i assume that the object's mass is m Kg. and the Earth's mass is M Kg.
i want to know the kenetic of object respect to the Earth's while the object is falling .

it may be m/M or M/m or equal to 1 or 0 .


i try to understand to law of kenetic energy but it so hard of this case for me.
thanks for pay attention to my doubt.

 

[ecneicS]

the kinetic energy of the falling object is constantly changing because its velocity is changing due to the acceleration due to gravity. You must specify at what location/time you want to know the object's kinetic energy.